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v2.4 : choix du clavier azerty ou qwerty

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<!DOCTYPE html>
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<title>_chordlab — user manual</title>
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<body>
<div class="sheet">
<div class="cover">
<div class="kicker">user manual · rev. 2.4 &nbsp;·&nbsp; <a href="tuto.html" style="color:var(--accent);text-decoration:none;border-bottom:1px solid var(--accent)">Version française</a></div>
<h1>_chordlab <em>ORC</em></h1>
<p>A chord and progression machine. The whole idea fits in one sentence: <strong>you don't play the notes of a chord, you describe it</strong> — a root, a type, some tensions — and the machine takes it from there, all the way to your synths or your DAW.</p>
</div>
<nav aria-label="Contents">
<a href="#s1">01 Interface</a>
<a href="#s2">02 First chord</a>
<a href="#s3">03 Tensions</a>
<a href="#s4">04 Voicing</a>
<a href="#s5">05 Key Mode</a>
<a href="#s6">06 Progression</a>
<a href="#s7">07 Performance</a>
<a href="#s8">08 Live MIDI</a>
<a href="#s9">09 Export & sessions</a>
<a href="#s10">10 Shortcuts</a>
</nav>
<!-- ============ 01 INTERFACE ============ -->
<section id="s1">
<div class="shead"><span class="num">01</span><h2>The front panel</h2></div>
<p>The screen is laid out like a hardware front panel. Six zones, always in the same place:</p>
<figure>
<div style="display:grid;grid-template-columns:1fr;gap:.5rem;position:relative">
<div style="background:var(--lcd-bg);border-radius:6px;padding:.6rem .8rem;position:relative">
<span style="color:var(--lcd-amber);font-weight:700;font-size:.95rem">Cm7</span>
<span style="color:var(--lcd-dim);font-size:.58rem;margin-left:.8rem">C4 · D#4 · G4 · A#4</span>
<span class="dot inplace" style="top:-8px;left:-8px">1</span>
</div>
<div style="display:grid;grid-template-columns:1.1fr 1.6fr .9fr;gap:.5rem">
<div style="background:var(--module-2);border:1px solid #4A4436;border-radius:6px;padding:.55rem;font-size:.58rem;color:var(--silk-light);position:relative;line-height:1.9">
CHORD TYPE<br>TENSIONS<br>ALTÉRATIONS
<span class="dot inplace" style="top:-8px;left:-8px">2</span>
</div>
<div style="background:var(--module-2);border:1px solid #4A4436;border-radius:6px;padding:.55rem;font-size:.58rem;color:var(--silk-light);position:relative;display:flex;align-items:center;justify-content:center">
ROOT — 1-octave keyboard
<span class="dot inplace" style="top:-8px;left:-8px">3</span>
</div>
<div style="background:var(--module-2);border:1px solid #4A4436;border-radius:6px;padding:.55rem;font-size:.58rem;color:var(--silk-light);position:relative;line-height:1.9">
VOICING<br>BASS · KEY
<span class="dot inplace" style="top:-8px;left:-8px">4</span>
</div>
</div>
<div style="background:var(--module-2);border:1px solid #4A4436;border-radius:6px;padding:.55rem;font-size:.58rem;color:var(--silk-light);position:relative">
PROGRESSION — slots · ADD · PLAY · perf · BPM
<span class="dot inplace" style="top:-8px;left:-8px">5</span>
</div>
<div style="background:var(--module-2);border:1px solid #4A4436;border-radius:6px;padding:.55rem;font-size:.58rem;color:var(--silk-light);position:relative">
MIDI OUT · EXPORT .MID · SESSION
<span class="dot inplace" style="top:-8px;left:-8px">6</span>
</div>
</div>
<ul class="legend">
<li><span class="dot">1</span><span class="t"><strong>LCD</strong> — your constant reference: chord name, actual notes, mode status.</span></li>
<li><span class="dot">2</span><span class="t"><strong>Chord description</strong> — type (one active at a time) plus tensions and alterations (stackable).</span></li>
<li><span class="dot">3</span><span class="t"><strong>Root</strong> — the only thing you actually “play”.</span></li>
<li><span class="dot">4</span><span class="t"><strong>Shaping</strong> — voicing, drop, bass, key.</span></li>
<li><span class="dot">5</span><span class="t"><strong>Sequence</strong> — the progression and its playback.</span></li>
<li><span class="dot">6</span><span class="t"><strong>Ins and outs</strong> — the bridge to your studio.</span></li>
</ul>
<figcaption>fig. 1 — front panel map</figcaption>
</figure>
</section>
<!-- ============ 02 FIRST CHORD ============ -->
<section id="s2">
<div class="shead"><span class="num">02</span><h2>Your first chord</h2></div>
<p>Three moves: pick a <strong>type</strong>, press a <strong>root</strong>, read the <strong>LCD</strong>. The chord sounds right away.</p>
<figure>
<div style="display:flex;gap:1.4rem;flex-wrap:wrap;align-items:flex-start">
<div style="position:relative">
<div style="font-size:.55rem;color:var(--silk-light);opacity:.5;letter-spacing:.18em;margin-bottom:.4rem">CHORD TYPE</div>
<div class="btnrow">
<div class="hwbtn"><span class="led"></span>DIM</div>
<div class="hwbtn on"><span class="led"></span>MIN</div>
<div class="hwbtn"><span class="led"></span>MAJ</div>
<div class="hwbtn"><span class="led"></span>SUS4</div>
</div>
<span class="dot inplace" style="top:14px;left:60px">1</span>
</div>
<div style="position:relative">
<div style="font-size:.55rem;color:var(--silk-light);opacity:.5;letter-spacing:.18em;margin-bottom:.4rem">ROOT</div>
<svg width="238" height="96" viewBox="0 0 238 96" role="img" aria-label="One-octave keyboard with C pressed">
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<text x="17" y="88" font-size="9" fill="#8A8070" text-anchor="middle">C</text>
</svg>
<span class="dot inplace" style="top:52px;left:6px">2</span>
</div>
<div style="position:relative">
<div style="font-size:.55rem;color:var(--silk-light);opacity:.5;letter-spacing:.18em;margin-bottom:.4rem">LCD</div>
<div class="lcd">
<div class="big">Cm</div>
<div class="small">C4 · D#4 · G4</div>
</div>
<span class="dot inplace" style="top:14px;left:-8px">3</span>
</div>
</div>
<ul class="legend">
<li><span class="dot">1</span><span class="t">Select <strong>MIN</strong> — the LED lights up; only one type is active at a time.</span></li>
<li><span class="dot">2</span><span class="t">Press <strong>C</strong> (mouse, touch, or the <span class="keycap">A</span> key on your computer keyboard).</span></li>
<li><span class="dot">3</span><span class="t">The LCD confirms: <strong>Cm</strong>, with the actual notes and their octaves.</span></li>
</ul>
<figcaption>fig. 2 — the core move: type + root → chord</figcaption>
</figure>
<h3>The eight types</h3>
<table>
<tr><th>Button</th><th>Chord</th><th>Intervals</th><th>Character</th></tr>
<tr><td><b>DIM</b></td><td>diminished</td><td>1 · ♭3 · ♭5</td><td>tense, passing</td></tr>
<tr><td><b>MIN</b></td><td>minor</td><td>1 · ♭3 · 5</td><td>dark, melancholic</td></tr>
<tr><td><b>MAJ</b></td><td>major</td><td>1 · 3 · 5</td><td>stable, bright</td></tr>
<tr><td><b>AUG</b></td><td>augmented</td><td>1 · 3 · ♯5</td><td>unsettled, strange</td></tr>
<tr><td><b>SUS2</b></td><td>suspended 2nd</td><td>1 · 2 · 5</td><td>open, airy</td></tr>
<tr><td><b>SUS4</b></td><td>suspended 4th</td><td>1 · 4 · 5</td><td>waiting to resolve</td></tr>
<tr><td><b>5</b></td><td>power chord</td><td>1 · 5</td><td>neutral, heavy</td></tr>
<tr><td><b>m♭6</b></td><td>minor flat 6th</td><td>1 · ♭3 · ♭6</td><td>dramatic, cinematic</td></tr>
</table>
</section>
<!-- ============ 03 TENSIONS ============ -->
<section id="s3">
<div class="shead"><span class="num">03</span><h2>Tensions & alterations</h2></div>
<p>The two lower rows <strong>stack</strong> freely on top of the type: several LEDs on at once. <strong>Tensions</strong> add notes; <strong>alterations</strong> change or remove notes that are already there.</p>
<figure>
<div style="font-size:.55rem;color:var(--silk-light);opacity:.5;letter-spacing:.18em;margin-bottom:.4rem">TENSIONS — add notes</div>
<div class="btnrow" style="margin-bottom:.8rem">
<div class="hwbtn"><span class="led"></span>6</div>
<div class="hwbtn on"><span class="led"></span>m7</div>
<div class="hwbtn"><span class="led"></span>M7</div>
<div class="hwbtn on"><span class="led"></span>9</div>
<div class="hwbtn"><span class="led"></span>♭9</div>
<div class="hwbtn"><span class="led"></span>♯9</div>
<div class="hwbtn"><span class="led"></span>11</div>
<div class="hwbtn"><span class="led"></span>♯11</div>
</div>
<div style="font-size:.55rem;color:var(--silk-light);opacity:.5;letter-spacing:.18em;margin-bottom:.4rem">ALTERATIONS — change / remove</div>
<div class="btnrow">
<div class="hwbtn"><span class="led"></span>13</div>
<div class="hwbtn"><span class="led"></span>♭5</div>
<div class="hwbtn"><span class="led"></span>♯5</div>
<div class="hwbtn"><span class="led"></span>no3</div>
</div>
<div style="margin-top:1rem;display:flex;align-items:center;gap:.8rem;flex-wrap:wrap">
<span style="font-size:.68rem;color:var(--silk-light)">MIN + m7 + 9 pressed →</span>
<div class="lcd"><div class="big">Cm7(9)</div><div class="small">C4 · D#4 · G4 · A#4 · D5</div></div>
</div>
<figcaption>fig. 3 — stacking: the deep-pad m9 chord in two LEDs</figcaption>
</figure>
<h3>Combinations worth knowing</h3>
<table>
<tr><th>Combination</th><th>Result</th><th>Why</th></tr>
<tr><td><b>DIM + 6</b></td><td>Cdim7</td><td>a 6th on a diminished triad <em>is</em> the diminished 7th</td></tr>
<tr><td><b>DIM + m7</b></td><td>Cø7</td><td>the half-diminished, backbone of the minor ii–V</td></tr>
<tr><td><b>MAJ + m7 + ♯9</b></td><td>C7(♯9)</td><td>the “Hendrix” chord</td></tr>
<tr><td><b>type + no3</b></td><td>open chord</td><td>neither major nor minor — perfect for ambient</td></tr>
<tr><td><b>m7 + M7</b></td><td>WTF?</td><td>the LCD warns you. You do you.</td></tr>
</table>
<div class="tip">♭5 and ♯5 <strong>replace</strong> the fifth rather than adding to it: C7♭5 contains F♯, not G plus F♯. That is what makes them usable straight away.</div>
</section>
<!-- ============ 04 VOICING ============ -->
<section id="s4">
<div class="shead"><span class="num">04</span><h2>Voicing</h2></div>
<p>The same chord can be tight, open, low or airy. Three independent tools stack up, in this order: <strong>rotation → drop → slash bass</strong>.</p>
<h3>4.1 · The rotation knob (±8)</h3>
<p>Each step <strong>rotates</strong> the chord: at +1 the lowest note jumps up an octave; at −1 the highest note drops down. Here is Cmaj7:</p>
<figure>
<svg width="100%" viewBox="0 0 640 220" role="img" aria-label="Voicing rotation: four positions of Cmaj7">
<!-- axe hauteur -->
<text x="10" y="16" font-size="10" fill="#7A6A3F">high ↑</text>
<text x="10" y="208" font-size="10" fill="#7A6A3F">low ↓</text>
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<rect x="400" y="144" width="60" height="14" rx="3" fill="#5C543F"/><text x="430" y="155" font-size="10" fill="#E0D6C3" text-anchor="middle">G4</text>
<rect x="400" y="128" width="60" height="14" rx="3" fill="#5C543F"/><text x="430" y="139" font-size="10" fill="#E0D6C3" text-anchor="middle">B4</text>
<rect x="400" y="72" width="60" height="14" rx="3" fill="#5C543F"/><text x="430" y="83" font-size="10" fill="#E0D6C3" text-anchor="middle">C5</text>
<rect x="400" y="38" width="60" height="14" rx="3" fill="#FFAE33"/><text x="430" y="49" font-size="10" fill="#26231D" text-anchor="middle" font-weight="700">E5</text>
</g>
<!-- V-1: B3 C4 E4 G4 -->
<g>
<text x="590" y="212" font-size="11" fill="#D8CFBB" text-anchor="middle">voicing −1</text>
<rect x="560" y="192" width="60" height="14" rx="3" fill="#FFAE33"/><text x="590" y="203" font-size="10" fill="#26231D" text-anchor="middle" font-weight="700">B3</text>
<rect x="560" y="176" width="60" height="14" rx="3" fill="#5C543F"/><text x="590" y="187" font-size="10" fill="#E0D6C3" text-anchor="middle">C4</text>
<rect x="560" y="160" width="60" height="14" rx="3" fill="#5C543F"/><text x="590" y="171" font-size="10" fill="#E0D6C3" text-anchor="middle">E4</text>
<rect x="560" y="144" width="60" height="14" rx="3" fill="#5C543F"/><text x="590" y="155" font-size="10" fill="#E0D6C3" text-anchor="middle">G4</text>
</g>
</svg>
<figcaption>fig. 4 — rotation: the amber note is the one that just moved by an octave</figcaption>
</figure>
<p>How to drive it: drag vertically on the knob, use the <code>−</code> <code>0</code> <code>+</code> buttons or the <span class="keycap">←</span><span class="keycap">→</span> arrows, double-click to return to 0. The same chord at +3 and at −2 tells two different stories.</p>
<h3>4.2 · Drop voicings</h3>
<p>Applied <strong>after</strong> the rotation, these spread the voices the way an arranger would:</p>
<figure>
<svg width="100%" viewBox="0 0 640 200" role="img" aria-label="Drop voicings compared on Cmaj7">
<text x="10" y="16" font-size="10" fill="#7A6A3F">high ↑</text>
<text x="10" y="192" font-size="10" fill="#7A6A3F">low ↓</text>
<!-- close: 60 64 67 71 → y=180-(m-48)*5 -->
<g>
<text x="140" y="196" font-size="11" fill="#D8CFBB" text-anchor="middle">close</text>
<circle cx="140" cy="120" r="7" fill="#FFAE33"/><text x="158" y="124" font-size="10" fill="#D8CFBB">C4</text>
<circle cx="140" cy="100" r="7" fill="#FFAE33"/><text x="158" y="104" font-size="10" fill="#D8CFBB">E4</text>
<circle cx="140" cy="85" r="7" fill="#FFAE33"/><text x="158" y="89" font-size="10" fill="#D8CFBB">G4</text>
<circle cx="140" cy="65" r="7" fill="#FFAE33"/><text x="158" y="69" font-size="10" fill="#D8CFBB">B4</text>
</g>
<!-- drop2: 55 60 64 71 -->
<g>
<text x="330" y="196" font-size="11" fill="#D8CFBB" text-anchor="middle">drop 2</text>
<circle cx="330" cy="145" r="7" fill="#E5482B"/><text x="348" y="149" font-size="10" fill="#D8CFBB">G3 ↓</text>
<circle cx="330" cy="120" r="7" fill="#FFAE33"/><text x="348" y="124" font-size="10" fill="#D8CFBB">C4</text>
<circle cx="330" cy="100" r="7" fill="#FFAE33"/><text x="348" y="104" font-size="10" fill="#D8CFBB">E4</text>
<circle cx="330" cy="65" r="7" fill="#FFAE33"/><text x="348" y="69" font-size="10" fill="#D8CFBB">B4</text>
</g>
<!-- spread: 60 76 67(+? ) spread on triad 60 64 67 → 60 67 76 -->
<g>
<text x="520" y="196" font-size="11" fill="#D8CFBB" text-anchor="middle">spread</text>
<circle cx="520" cy="120" r="7" fill="#FFAE33"/><text x="538" y="124" font-size="10" fill="#D8CFBB">C4</text>
<circle cx="520" cy="85" r="7" fill="#FFAE33"/><text x="538" y="89" font-size="10" fill="#D8CFBB">G4</text>
<circle cx="520" cy="40" r="7" fill="#E5482B"/><text x="538" y="44" font-size="10" fill="#D8CFBB">E5 ↑</text>
</g>
</svg>
<ul class="legend">
<li><span class="dot" style="background:#E5482B;box-shadow:none;color:#FFF3E4">↕</span><span class="t">The red notes are the ones moved by an octave by the drop mode.</span></li>
</ul>
<figcaption>fig. 5 — close · drop 2 (the jazz voicing) · spread (wide pad)</figcaption>
</figure>
<table>
<tr><th>Mode</th><th>Effect</th><th>Use</th></tr>
<tr><td><b>close</b></td><td>close position (no change)</td><td>default</td></tr>
<tr><td><b>drop 2</b></td><td>2nd voice from the top → −1 oct</td><td>the jazz standard</td></tr>
<tr><td><b>drop 3</b></td><td>3rd voice from the top → −1 oct</td><td>wide gaps, guitar-like</td></tr>
<tr><td><b>drop 2+4</b></td><td>two voices dropped</td><td>very open, cinematic</td></tr>
<tr><td><b>spread</b></td><td>every other voice → +1 oct</td><td>wide pads, ambient</td></tr>
</table>
<h3>4.3 · Bass and slash chords</h3>
<p>The <strong>BASS</strong> button adds a held note (−1 or −2 octaves) on its <strong>own MIDI channel</strong>. The <strong>bass /</strong> selector picks which chord tone it plays: root, third, fifth or seventh — the LCD then reads <code>C/E</code>. Detection follows the chord: minor third on a minor chord, diminished fifth on a ♭5. If the chord has no seventh, asking for one falls back to the root.</p>
</section>
<!-- ============ 05 KEY MODE ============ -->
<section id="s5">
<div class="shead"><span class="num">05</span><h2>Key Mode — one-finger diatonic chords</h2></div>
<p>Turn on <strong>KEY</strong>, choose a tonic and one of the eight scales. Every key then produces <strong>the diatonic chord for its degree</strong> — you cannot fall out of the key.</p>
<figure>
<svg width="100%" viewBox="0 0 480 150" role="img" aria-label="Key Mode in C major: black keys dimmed, diatonic chords under each white key">
<g stroke="#B9AE97" stroke-width="1">
<rect x="1" y="1" width="66" height="110" fill="var(--key-w)"/>
<rect x="69" y="1" width="66" height="110" fill="var(--key-w)"/>
<rect x="137" y="1" width="66" height="110" fill="var(--key-w)"/>
<rect x="205" y="1" width="66" height="110" fill="var(--key-w)"/>
<rect x="273" y="1" width="66" height="110" fill="var(--key-w)"/>
<rect x="341" y="1" width="66" height="110" fill="var(--key-w)"/>
<rect x="409" y="1" width="66" height="110" fill="var(--key-w)"/>
</g>
<!-- black keys dimmed (out of key in C major) -->
<g fill="#4B4739" opacity=".55">
<rect x="46" y="1" width="42" height="64" rx="4"/>
<rect x="114" y="1" width="42" height="64" rx="4"/>
<rect x="250" y="1" width="42" height="64" rx="4"/>
<rect x="318" y="1" width="42" height="64" rx="4"/>
<rect x="386" y="1" width="42" height="64" rx="4"/>
</g>
<!-- resulting chords -->
<g font-size="13" fill="#403A2F" text-anchor="middle" font-weight="700">
<text x="34" y="100">C</text>
<text x="102" y="100">Dm</text>
<text x="170" y="100">Em</text>
<text x="238" y="100">F</text>
<text x="306" y="100">G</text>
<text x="374" y="100">Am</text>
<text x="442" y="100">Bdim</text>
</g>
<g font-size="10" fill="#7A6A3F" text-anchor="middle">
<text x="34" y="138">I</text>
<text x="102" y="138">ii</text>
<text x="170" y="138">iii</text>
<text x="238" y="138">IV</text>
<text x="306" y="138">V</text>
<text x="374" y="138">vi</text>
<text x="442" y="138">vii°</text>
</g>
</svg>
<figcaption>fig. 6 — Key Mode in C major: each key gives its degree’s chord; out-of-key notes are dimmed and silent</figcaption>
</figure>
<p>The <code>6</code> <code>m7</code> <code>M7</code> <code>9</code> <code>11</code> <code>13</code> tensions stay active and are harmonised <strong>within the scale</strong>: the 7th on G in C major gives a real G7 (with a natural F). The asterisk in the name (<code>G7*</code>) marks that diatonic harmonisation.</p>
<div class="tip"><strong>Harmonic minor</strong> is worth a try: its V degree becomes a genuine dominant chord with a leading tone — the classic minor cadence, with one finger.</div>
</section>
<!-- ============ 06 PROGRESSION ============ -->
<section id="s6">
<div class="shead"><span class="num">06</span><h2>Building a progression</h2></div>
<p>Play a chord, then hit <strong>ADD</strong> (or <span class="keycap">space</span>): it becomes a slot in the sequence. Anatomy of a slot:</p>
<figure>
<div style="display:flex;justify-content:center;padding:1.4rem 0 .6rem">
<div style="position:relative;background:var(--module-2);border:1px solid #4A4436;border-radius:7px;padding:.5rem .7rem .4rem;min-width:150px;color:var(--silk-light);font-size:.72rem">
<span style="position:absolute;top:2px;right:6px;opacity:.5">×</span>
<div style="font-weight:700;color:var(--lcd-amber);font-size:.9rem">Fm7</div>
<div style="opacity:.55;font-size:.56rem;margin-top:.15rem">F G# C D# +B</div>
<div style="display:flex;gap:.35rem;margin-top:.35rem;align-items:center">
<span style="opacity:.5">‹</span>
<span style="opacity:.7">−</span>
<span style="background:#1E1B15;border:1px solid #4A4436;border-radius:4px;font-size:.55rem;padding:.1rem .3rem">3♩</span>
<span style="opacity:.7">+</span>
<span style="opacity:.5">›</span>
</div>
<span class="dot inplace" style="top:-10px;right:-4px;left:auto">1</span>
<span class="dot inplace" style="top:16px;left:-10px">2</span>
<span class="dot inplace" style="bottom:26px;left:-10px;top:auto">3</span>
<span class="dot inplace" style="bottom:-6px;left:64px;top:auto">4</span>
<span class="dot inplace" style="bottom:-6px;right:-4px;left:auto;top:auto">5</span>
</div>
</div>
<ul class="legend">
<li><span class="dot">1</span><span class="t"><strong>×</strong> — delete the slot.</span></li>
<li><span class="dot">2</span><span class="t">Name, notes, and <code>+B</code> when the bass is on.</span></li>
<li><span class="dot">3</span><span class="t"><strong>Click the slot</strong> — audition it on its own.</span></li>
<li><span class="dot">4</span><span class="t"><strong>− / +</strong> — length from <strong>1 to 16 beats</strong>, one beat at a time. A 3-, 5- or 7-beat chord fits in a single slot.</span></li>
<li><span class="dot">5</span><span class="t"><strong>‹ ›</strong> — move the slot along the sequence.</span></li>
</ul>
<figcaption>fig. 7 — anatomy of a progression slot</figcaption>
</figure>
<h3>Three ways to fill the sequence</h3>
<table>
<tr><th>Method</th><th>Action</th><th>When</th></tr>
<tr><td><b>By hand</b></td><td>play + ADD</td><td>you know where you are going</td></tr>
<tr><td><b>Presets</b></td><td>pick a progression + load</td><td>instant starting point in your key (I–V–vi–IV, ii–V–I, circle of fifths…)</td></tr>
<tr><td><b>✦ suggest</b></td><td>one click = one proposed chord</td><td>let the machine drift using functional harmony, take over when it gets interesting</td></tr>
</table>
<h3>Voice leading</h3>
<p>The same progression, voiced two ways:</p>
<figure>
<svg width="100%" viewBox="0 0 640 170" role="img" aria-label="With and without voice leading">
<text x="150" y="16" font-size="11" fill="#D8CFBB" text-anchor="middle">without VL — voices jump</text>
<g stroke="#E5482B" stroke-width="2" opacity=".85">
<line x1="70" y1="120" x2="150" y2="60"/><line x1="150" y1="60" x2="230" y2="130"/>
<line x1="70" y1="100" x2="150" y2="40"/><line x1="150" y1="40" x2="230" y2="110"/>
<line x1="70" y1="85" x2="150" y2="25"/><line x1="150" y1="25" x2="230" y2="90"/>
</g>
<g fill="#FFAE33">
<circle cx="70" cy="120" r="6"/><circle cx="70" cy="100" r="6"/><circle cx="70" cy="85" r="6"/>
<circle cx="150" cy="60" r="6"/><circle cx="150" cy="40" r="6"/><circle cx="150" cy="25" r="6"/>
<circle cx="230" cy="130" r="6"/><circle cx="230" cy="110" r="6"/><circle cx="230" cy="90" r="6"/>
</g>
<g font-size="10" fill="#7A6A3F" text-anchor="middle">
<text x="70" y="155">C</text><text x="150" y="155">F</text><text x="230" y="155">G</text>
</g>
<text x="490" y="16" font-size="11" fill="#D8CFBB" text-anchor="middle">with VL — voices glide</text>
<g stroke="#8BC34A" stroke-width="2" opacity=".9">
<line x1="410" y1="120" x2="490" y2="112"/><line x1="490" y1="112" x2="570" y2="118"/>
<line x1="410" y1="100" x2="490" y2="95"/><line x1="490" y1="95" x2="570" y2="102"/>
<line x1="410" y1="85" x2="490" y2="78"/><line x1="490" y1="78" x2="570" y2="84"/>
</g>
<g fill="#FFAE33">
<circle cx="410" cy="120" r="6"/><circle cx="410" cy="100" r="6"/><circle cx="410" cy="85" r="6"/>
<circle cx="490" cy="112" r="6"/><circle cx="490" cy="95" r="6"/><circle cx="490" cy="78" r="6"/>
<circle cx="570" cy="118" r="6"/><circle cx="570" cy="102" r="6"/><circle cx="570" cy="84" r="6"/>
</g>
<g font-size="10" fill="#7A6A3F" text-anchor="middle">
<text x="410" y="155">C</text><text x="490" y="155">F</text><text x="570" y="155">G</text>
</g>
</svg>
<figcaption>fig. 8 — voice leading picks the voicing that keeps the voices moving as little as possible</figcaption>
</figure>
<p><strong>VL AUTO</strong> (in the transport) applies this on every ADD; <strong>⇄ voice-leading</strong> re-voices the whole existing progression in one go. Try it right after loading a preset — you hear the difference immediately.</p>
</section>
<!-- ============ 07 PERFORMANCE ============ -->
<section id="s7">
<div class="shead"><span class="num">07</span><h2>Playback & performance modes</h2></div>
<p><strong>PLAY</strong> runs the progression at the displayed BPM, <strong>LOOP</strong> repeats it. The <strong>perf</strong> selector changes how each chord is delivered — everywhere: auditioning, live MIDI and <code>.mid</code> export.</p>
<figure>
<svg width="100%" viewBox="0 0 640 240" role="img" aria-label="Three performance modes as piano roll: block, strum, arpeggio">
<!-- BLOCK -->
<text x="60" y="22" font-size="11" fill="#D8CFBB">block</text>
<g fill="#FFAE33">
<rect x="120" y="10" width="440" height="10" rx="2"/>
<rect x="120" y="26" width="440" height="10" rx="2"/>
<rect x="120" y="42" width="440" height="10" rx="2"/>
</g>
<!-- STRUM -->
<text x="60" y="102" font-size="11" fill="#D8CFBB">strum ↑</text>
<g fill="#FFAE33">
<rect x="120" y="106" width="440" height="10" rx="2"/>
<rect x="150" y="90" width="410" height="10" rx="2"/>
<rect x="180" y="74" width="380" height="10" rx="2"/>
</g>
<!-- ARP -->
<text x="60" y="182" font-size="11" fill="#D8CFBB">arp ↑ 1/16</text>
<g fill="#FFAE33">
<rect x="120" y="200" width="42" height="10" rx="2"/>
<rect x="175" y="184" width="42" height="10" rx="2"/>
<rect x="230" y="168" width="42" height="10" rx="2"/>
<rect x="285" y="200" width="42" height="10" rx="2"/>
<rect x="340" y="184" width="42" height="10" rx="2"/>
<rect x="395" y="168" width="42" height="10" rx="2"/>
<rect x="450" y="200" width="42" height="10" rx="2"/>
<rect x="505" y="184" width="42" height="10" rx="2"/>
</g>
<line x1="120" y1="228" x2="560" y2="228" stroke="#4A4436" stroke-width="1"/>
<text x="120" y="240" font-size="9" fill="#7A6A3F">t = 0</text>
<text x="560" y="240" font-size="9" fill="#7A6A3F" text-anchor="end">slot length →</text>
</svg>
<figcaption>fig. 9 — the same triad as block, strum and arpeggio</figcaption>
</figure>
<table>
<tr><th>Mode</th><th>Output</th></tr>
<tr><td><b>block</b></td><td>chord played as a block</td></tr>
<tr><td><b>strum ↑ / ↓</b></td><td>notes rolled upwards / downwards, guitar style</td></tr>
<tr><td><b>harp</b></td><td>fast sweep (glissando)</td></tr>
<tr><td><b>arp ↑ / ↓ / ↕ / rnd</b></td><td>arpeggio at the speed set by <b>rate</b> (1/8 · 1/16 · 1/32)</td></tr>
</table>
<p><strong>HUM</strong> humanises velocity (±10) and timing (±15 ms) — strums and arpeggios breathe.</p>
</section>
<!-- ============ 08 MIDI LIVE ============ -->
<section id="s8">
<div class="shead"><span class="num">08</span><h2>Live MIDI to your studio</h2></div>
<p>Every chord you click, every slot you audition and the full playback go out over MIDI on <strong>two separate channels</strong> — chords and bass drive two different machines at once.</p>
<figure>
<svg width="100%" viewBox="0 0 640 190" role="img" aria-label="MIDI routing: chordlab to USB interface, then Pro-800 on channel 3 and TD-3 on channel 5">
<rect x="20" y="65" width="140" height="60" rx="8" fill="#332F27" stroke="#4A4436"/>
<text x="90" y="92" font-size="12" fill="#FFB454" text-anchor="middle" font-weight="700">_chordlab</text>
<text x="90" y="110" font-size="9" fill="#7A6A3F" text-anchor="middle">browser (https)</text>
<line x1="160" y1="95" x2="240" y2="95" stroke="#FFAE33" stroke-width="2.5" marker-end="url(#arr2)"/>
<text x="200" y="86" font-size="9" fill="#D8CFBB" text-anchor="middle">Web MIDI</text>
<rect x="240" y="65" width="130" height="60" rx="8" fill="#332F27" stroke="#4A4436"/>
<text x="305" y="92" font-size="11" fill="#D8CFBB" text-anchor="middle" font-weight="700">interface</text>
<text x="305" y="108" font-size="9" fill="#7A6A3F" text-anchor="middle">USB-MIDI</text>
<path d="M 370 82 C 420 82 420 40 468 40" stroke="#FFAE33" stroke-width="2.5" fill="none" marker-end="url(#arr2)"/>
<text x="418" y="48" font-size="10" fill="#FFAE33" text-anchor="middle" font-weight="700">ch 3</text>
<path d="M 370 108 C 420 108 420 150 468 150" stroke="#E5482B" stroke-width="2.5" fill="none" marker-end="url(#arr3)"/>
<text x="418" y="142" font-size="10" fill="#E5482B" text-anchor="middle" font-weight="700">ch 5</text>
<rect x="470" y="14" width="150" height="52" rx="8" fill="#332F27" stroke="#4A4436"/>
<text x="545" y="36" font-size="11" fill="#D8CFBB" text-anchor="middle" font-weight="700">Pro-800</text>
<text x="545" y="52" font-size="9" fill="#7A6A3F" text-anchor="middle">chords / pads</text>
<rect x="470" y="124" width="150" height="52" rx="8" fill="#332F27" stroke="#4A4436"/>
<text x="545" y="146" font-size="11" fill="#D8CFBB" text-anchor="middle" font-weight="700">TD-3 + K-2</text>
<text x="545" y="162" font-size="9" fill="#7A6A3F" text-anchor="middle">bass (unison)</text>
<defs>
<marker id="arr2" markerWidth="8" markerHeight="8" refX="6" refY="3" orient="auto"><path d="M0,0 L6,3 L0,6 Z" fill="#FFAE33"/></marker>
<marker id="arr3" markerWidth="8" markerHeight="8" refX="6" refY="3" orient="auto"><path d="M0,0 L6,3 L0,6 Z" fill="#E5482B"/></marker>
</defs>
</svg>
<figcaption>fig. 10 — default routing: chords on ch3, bass on ch5 (both editable in the MIDI panel)</figcaption>
</figure>
<p>Getting going: <strong>①</strong> plug the interface in before opening the page (or reload), <strong>②</strong> allow the MIDI access the browser asks for, <strong>③</strong> select the device in the <strong>MIDI out (live)</strong> panel. The LCD reads <code>MIDI ON</code>.</p>
<div class="tip warn"><strong>Web MIDI needs HTTPS</strong> (or localhost). Over <code>file://</code>, audio and export still work but live MIDI output does not — which is why the app is hosted at <code>chordlab.ghostinthemachine.fr</code>. Safari does not support Web MIDI: use Chrome, Edge or Firefox. Stuck note on a machine? <strong>STOP</strong> sends All Notes Off across all 16 channels.</div>
</section>
<!-- ============ 09 EXPORT ============ -->
<section id="s9">
<div class="shead"><span class="num">09</span><h2>Export & sessions</h2></div>
<figure>
<svg width="100%" viewBox="0 0 640 120" role="img" aria-label="Export flow: progression to .mid file to DAW or tracker">
<rect x="20" y="35" width="150" height="50" rx="8" fill="#332F27" stroke="#4A4436"/>
<text x="95" y="57" font-size="11" fill="#D8CFBB" text-anchor="middle" font-weight="700">progression</text>
<text x="95" y="72" font-size="9" fill="#7A6A3F" text-anchor="middle">slots + lengths</text>
<line x1="170" y1="60" x2="240" y2="60" stroke="#FFAE33" stroke-width="2.5" marker-end="url(#arr4)"/>
<rect x="242" y="35" width="130" height="50" rx="8" fill="#332F27" stroke="#4A4436"/>
<text x="307" y="57" font-size="11" fill="#FFB454" text-anchor="middle" font-weight="700">.mid</text>
<text x="307" y="72" font-size="9" fill="#7A6A3F" text-anchor="middle">format 1 · PPQ 480 · tempo</text>
<path d="M 372 50 C 410 50 410 30 448 30" stroke="#FFAE33" stroke-width="2" fill="none" marker-end="url(#arr4)"/>
<path d="M 372 70 C 410 70 410 92 448 92" stroke="#FFAE33" stroke-width="2" fill="none" marker-end="url(#arr4)"/>
<text x="530" y="34" font-size="11" fill="#D8CFBB" font-weight="700">DAW (drag and drop)</text>
<text x="530" y="96" font-size="11" fill="#D8CFBB" font-weight="700">Tracker Mini (SD card)</text>
<defs><marker id="arr4" markerWidth="8" markerHeight="8" refX="6" refY="3" orient="auto"><path d="M0,0 L6,3 L0,6 Z" fill="#FFAE33"/></marker></defs>
</svg>
<figcaption>fig. 11 — one file, two destinations</figcaption>
</figure>
<table>
<tr><th>Export option</th><th>Choice</th></tr>
<tr><td><b>tracks</b></td><td>chords + bass (2 tracks, each on its own channel) · or chords only</td></tr>
<tr><td><b>render perf</b></td><td><b>yes</b>: strums and arpeggios are written note by note into the file · <b>no</b>: block chords (better if you plan to arpeggiate later in the DAW or tracker)</td></tr>
</table>
<h3>Sessions</h3>
<p><strong>↓ save session</strong> writes a <code>.json</code> holding every setting and the full progression; <strong>↑ load</strong> restores all of it. Nothing is kept in the browser: the file is the only persistence — version your sessions in Git like any other project file.</p>
</section>
<!-- ============ 10 RACCOURCIS ============ -->
<section id="s10">
<div class="shead"><span class="num">10</span><h2>Keyboard shortcuts</h2></div>
<p>The letters follow a piano layout. A <strong>QWERTY / AZERTY</strong> switch sits under the on-screen keyboard: only two keys differ between the two layouts, but they are C and C sharp, so the right setting makes all the difference. The app picks a layout at startup based on your browser language — change it with one click if needed, and the choice is stored in <code>.json</code> sessions.</p>
<figure>
<div style="text-align:center;padding:.4rem 0 .2rem">
<div style="margin-bottom:.5rem">
<span style="font-size:.55rem;color:var(--silk-light);opacity:.5;letter-spacing:.16em;display:block;margin-bottom:.25rem">QWERTY</span>
<span class="keycap">A</span><span class="keycap">W</span><span class="keycap">S</span><span class="keycap">E</span><span class="keycap">D</span><span class="keycap">F</span><span class="keycap">T</span><span class="keycap">G</span><span class="keycap">Y</span><span class="keycap">H</span><span class="keycap">U</span><span class="keycap">J</span>
</div>
<div style="margin-bottom:.7rem">
<span style="font-size:.55rem;color:var(--silk-light);opacity:.5;letter-spacing:.16em;display:block;margin-bottom:.25rem">AZERTY</span>
<span class="keycap" style="border-color:var(--accent)">Q</span><span class="keycap" style="border-color:var(--accent)">Z</span><span class="keycap">S</span><span class="keycap">E</span><span class="keycap">D</span><span class="keycap">F</span><span class="keycap">T</span><span class="keycap">G</span><span class="keycap">Y</span><span class="keycap">H</span><span class="keycap">U</span><span class="keycap">J</span>
<span style="font-size:.68rem;color:var(--silk-light);margin-left:.6rem">= C → B</span>
</div>
<div>
<span class="keycap" style="padding:.18rem 2.2rem">espace</span>
<span style="font-size:.68rem;color:var(--silk-light);margin:0 1rem 0 .4rem">ADD</span>
<span class="keycap">←</span><span class="keycap">→</span>
<span style="font-size:.68rem;color:var(--silk-light);margin-left:.4rem">voicing −1 / +1</span>
</div>
</div>
<figcaption>fig. 12 — only the first two keys differ between layouts</figcaption>
</figure>
<h3>Two reference workflows</h3>
<table>
<tr><th>Dawless (hardware session)</th><th>DAW / tracker (writing)</th></tr>
<tr>
<td>KEY ON → preset or ✦ suggest → ⇄ voice-leading → live MIDI (Pro-800 + TD-3) → LOOP while you shape the sounds and record to the mixer → save a .json session</td>
<td>KEY OFF, free exploration of colours (types + tensions + drops) → VL AUTO → export .mid with <b>render perf: no</b> → import into the DAW or Tracker Mini → arpeggiation and sound design in the target machine</td>
</tr>
</table>
</section>
<footer>_chordlab · manual rev. 2.4 · underscorelab / leradiologue</footer>
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