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<!doctype html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<title>Progression — Docs</title>
<link rel="icon" type="image/svg+xml" href="favicon.svg" />
<meta
name="description"
content="Documentation for Progression — a backing-track tool for practicing scales, solos, and chord shapes."
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<body>
<div id="sticky-top">
<header>
<span class="header-title">Progression</span>
<a href="./" class="open-app-btn">Open App</a>
</header>
<nav class="tab-nav" role="tablist">
<button class="tab-btn active" role="tab" data-tab="quick-start" aria-selected="true">
Quick Start
</button>
<button class="tab-btn" role="tab" data-tab="reference" aria-selected="false">
Reference
</button>
</nav>
</div>
<main>
<!-- ── Quick Start ── -->
<section class="tab-panel active" id="tab-quick-start" role="tabpanel">
<p>
Progression is a backing-track tool for musicians. Enter a chord progression, set your key
and tempo, and loop it while you practice scales, solos, or chord shapes.
</p>
<p>
It's easy to get started in seconds — and when you're ready to go deeper, there's a lot to
explore.
</p>
<div class="idea-card">
<h3>Try it now</h3>
<p>
A progression is already loaded — press <strong>Play</strong> and you're off. Chord
chips highlight as each chord plays.
</p>
<a href="./" class="idea-link">Open App →</a>
<p class="back-hint">
Jump back here anytime using the
<span
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</span>
icon in the top-right corner. The <a href="#reference">Reference tab</a> has the full
feature guide.
</p>
</div>
<hr />
<h2 id="practice-ideas">
Practice Ideas
<button class="anchor-copy" data-id="practice-ideas" title="Copy link to this section">
#
</button>
</h2>
<p>Each example opens the app pre-configured. Press play and start practicing.</p>
<div class="idea-card">
<h3>Triads!</h3>
<p>
Play all 3 major triad inversions on a string set around the circle of 4ths. For
example, limit yourself to the G, B, and high E strings. Repeat for the other 3 string
set combinations!
</p>
<a
href="./?key=C&tempo=75&bars=2&cycle=4ths&style=funk&bass=busy&voicing=voice-lead-loop§ion=I&arrangement=&activeSection=1&advance=auto&chordVol=50&bassVol=100&drumVol=100&masterVol=100&chordsOn=1&bassOn=1&drumsOn=1"
class="idea-link"
>Try it →</a
>
</div>
<div class="idea-card">
<h3>Triad Progression</h3>
<p>
Play triads over a basic progression mixing major and minor chords. To start, try to
stay on one string set and in one area of the neck. This example stays in a single key,
but you can <a href="#playback-screen">manually switch keys</a> or have the player
<a href="#loop-modes">cycle the keys</a>.
</p>
<a
href="./?key=C&tempo=75&bars=2&cycle=none&style=funk&bass=busy&voicing=voice-lead-loop§ion=I+vi+ii+V&arrangement=&activeSection=1&advance=auto&chordVol=50&bassVol=100&drumVol=100&masterVol=100&chordsOn=1&bassOn=1&drumsOn=1"
class="idea-link"
>Try it →</a
>
</div>
<div class="idea-card">
<h3>12-bar blues</h3>
<p>
Classic I–IV–V form with dominant 7ths at a medium rock tempo. Solo over the changes or
comp along. Swap the key to match a jam partner.
</p>
<a
href="./?section=I7%3A4+IV7%3A2+I7%3A2+V7+IV7+I7+V7&bars=1&style=rock&tempo=90"
class="idea-link"
>Try it →</a
>
</div>
<div class="idea-card">
<h3>Mixolydian groove</h3>
<p>
The I–V–bVII–IV progression is the backbone of classic rock and blues-rock. The bVII
chord is what makes it Mixolydian — it implies the flatted 7th, so reach for the
Mixolydian scale (major scale with a b7) instead of the regular major scale. Try it in A
to match most classic rock jams.
</p>
<a
href="./?key=A&tempo=100&bars=2&cycle=none&style=rock§ion=I+V+bVII+IV&advance=auto"
class="idea-link"
>Try it →</a
>
</div>
<div class="idea-card">
<h3>Diatonic chords in one key</h3>
<p>
Loop all seven diatonic chords in order at a slow tempo. Great for learning how each
chord sounds within the key. Try soloing with just the major scale throughout.
</p>
<a
href="./?section=I%20ii%20iii%20IV%20V%20vi%20viidim&tempo=70&voicing=root&style=pop"
class="idea-link"
>Try it →</a
>
</div>
</section>
<!-- ── Reference ── -->
<section class="tab-panel" id="tab-reference" role="tabpanel">
<h2 id="playback-screen">
Playback screen
<button class="anchor-copy" data-id="playback-screen" title="Copy link to this section">
#
</button>
</h2>
<p>The main screen shows everything you need while you play — no drawers required.</p>
<h3 id="preset-pill">
Preset pill
<button class="anchor-copy" data-id="preset-pill" title="Copy link to this section">
#
</button>
</h3>
<p>
The pill in the top-left shows the currently loaded <a href="#presets">preset</a> name. A
<strong>*</strong> means you have unsaved changes. Tap it to save, revert, or switch
presets without opening Setup.
</p>
<h3 id="key-display">
Key display
<button class="anchor-copy" data-id="key-display" title="Copy link to this section">
#
</button>
</h3>
<p>
The large key name at the top (e.g. <strong>C</strong>) shows the current key. Tap it to
open an inline key picker — select a new key and it takes effect at the start of the next
loop.
</p>
<h3 id="chord-chips">
Chord chips
<button class="anchor-copy" data-id="chord-chips" title="Copy link to this section">
#
</button>
</h3>
<p>
Each chip shows the resolved chord name for the current key. The active chip highlights
during playback, and bar-progress dots appear below it when
<strong>Bars per chord</strong> is greater than 1.
</p>
<h3 id="beat-indicator">
Beat indicator
<button class="anchor-copy" data-id="beat-indicator" title="Copy link to this section">
#
</button>
</h3>
<p>Four dots below the chord strip pulse on each beat.</p>
<h3 id="readout-pills">
Readout pills
<button class="anchor-copy" data-id="readout-pills" title="Copy link to this section">
#
</button>
</h3>
<p>
The row of pills below the chord strip — <a href="#style-bass">Style</a>,
<a href="#style-bass">Bass</a>, <a href="#style-bass">Drums</a>,
<a href="#voicing">Voicing</a>, <a href="#bars">Bars</a>, <a href="#tempo">BPM</a>,
<a href="#loop-modes">Loop mode</a> — show the current values and cycle their options on
tap. All changes apply live during playback. Full options for each are in
<a href="#setup">Setup</a>.
</p>
<p>
Tapping <strong>BPM</strong> opens a popover with a slider, ± nudge buttons, and a
tap-tempo button.
</p>
<h3 id="play-pause-stop">
Play / Pause / Stop
<button class="anchor-copy" data-id="play-pause-stop" title="Copy link to this section">
#
</button>
</h3>
<p>
<strong>Play / Pause</strong> — tap once to start, tap again to pause at the current
chord. Spacebar also works when no text input is focused.
</p>
<p>
<strong>Stop</strong> (■) — appears next to Play while paused; resets playback to the
beginning.
</p>
<p>
<a href="#setup">Setup</a> and <a href="#mix">Mix</a> buttons live in the action bar at
the bottom left and right.
</p>
<hr />
<h2 id="setup">
Setup
<button class="anchor-copy" data-id="setup" title="Copy link to this section">#</button>
</h2>
<p>
Open from the <strong>Setup</strong> button in the action bar. Controls are grouped into
Playback, Progression, and App sections. Presets are managed via the pill in the top-left
corner — see <a href="#presets">Presets</a>.
</p>
<h3 id="key">
Key <button class="anchor-copy" data-id="key" title="Copy link to this section">#</button>
</h3>
<p>
A dropdown with all 12 keys. Same as tapping the key display on the main screen — changes
take effect at the start of the next loop.
</p>
<h3 id="tempo">
Tempo
<button class="anchor-copy" data-id="tempo" title="Copy link to this section">#</button>
</h3>
<p>
A tempo slider with a <strong>Tap tempo</strong> button — tap the beat to detect tempo.
Changes apply immediately, even during playback.
</p>
<h3 id="bars">
Bars per chord
<button class="anchor-copy" data-id="bars" title="Copy link to this section">#</button>
</h3>
<p>
Sets how many bars each chord plays before the progression advances: <strong>1</strong>,
<strong>2</strong>, or <strong>4</strong>. Individual chords can override this with
<a href="#progression-syntax">per-chord bar notation</a> (<code>V:4</code>).
<a href="./?bars=4" class="try-link">Try 4 bars →</a>
</p>
<hr />
<h2 id="loop-modes">
Loop modes
<button class="anchor-copy" data-id="loop-modes" title="Copy link to this section">
#
</button>
</h2>
<p>
Controls how the key changes (or doesn't) across repeated runs. Set via the Loop mode
buttons in Setup or the Loop mode pill on the main screen.
</p>
<h3 id="loop-mode-loop">
Loop
<button class="anchor-copy" data-id="loop-mode-loop" title="Copy link to this section">
#
</button>
</h3>
<p>Repeats the progression indefinitely in the configured key. The default mode.</p>
<h3 id="loop-4ths">
Cycle 4ths
<button class="anchor-copy" data-id="loop-4ths" title="Copy link to this section">
#
</button>
</h3>
<p>
Plays the progression through all 12 keys ascending by perfect fourths. The key display
updates each lap. <a href="./?cycle=4ths" class="try-link">Try Cycle 4ths →</a>
</p>
<h3 id="loop-5ths">
Cycle 5ths
<button class="anchor-copy" data-id="loop-5ths" title="Copy link to this section">
#
</button>
</h3>
<p>
Same as Cycle 4ths, ascending by perfect fifths.
<a href="./?cycle=5ths" class="try-link">Try Cycle 5ths →</a>
</p>
<h3 id="loop-custom">
Custom key sequence
<button class="anchor-copy" data-id="loop-custom" title="Copy link to this section">
#
</button>
</h3>
<p>
Define your own key sequence in any order. Select <strong>Custom</strong> in the Loop mode
group. A key grid appears; tap any key to append it to your sequence. The sequence is
shown as a numbered list above the grid; reorder with ↑↓ and remove with ×.
</p>
<p>
Each entry plays one complete run through the progression before advancing to the next
key. Accidentals follow the target key's natural spelling.
</p>
<a href="./?cycle=custom&customKeys=C,F,Bb,Eb§ion=ii+V+I" class="try-link"
>Try Custom (C→F→Bb→Eb) →</a
>
<h3 id="key-scrubber">
KEY scrubber
<button class="anchor-copy" data-id="key-scrubber" title="Copy link to this section">
#
</button>
</h3>
<p>
When any cycle mode is active, a <strong>KEY</strong> row appears in the action bar
showing every key in the sequence. The current key is highlighted.
</p>
<ul>
<li>
<strong>While playing</strong> — tap a segment to queue a jump to that key; it takes
effect after the full progression completes in the current key. Tap the same segment
again to cancel.
</li>
<li>
<strong>While stopped or paused</strong> — tap a segment to set the starting key. Chord
chips and the key display update immediately.
</li>
</ul>
<hr />
<h2 id="style-bass">
Style, Bass & Drums
<button class="anchor-copy" data-id="style-bass" title="Copy link to this section">
#
</button>
</h2>
<h3 id="style-pop">
Pop
<button class="anchor-copy" data-id="style-pop" title="Copy link to this section">
#
</button>
</h3>
<p>Straight and steady. <a href="./?style=pop" class="try-link">Try Pop →</a></p>
<h3 id="style-funk">
Funk
<button class="anchor-copy" data-id="style-funk" title="Copy link to this section">
#
</button>
</h3>
<p>Syncopated, tight pocket. <a href="./?style=funk" class="try-link">Try Funk →</a></p>
<h3 id="style-ballad">
Ballad
<button class="anchor-copy" data-id="style-ballad" title="Copy link to this section">
#
</button>
</h3>
<p>
Half-time feel, sparse. Pairs well with slow tempos.
<a href="./?style=ballad&tempo=65" class="try-link">Try Ballad →</a>
</p>
<h3 id="style-rock">
Rock
<button class="anchor-copy" data-id="style-rock" title="Copy link to this section">
#
</button>
</h3>
<p>Driving 8ths, heavier kick. <a href="./?style=rock" class="try-link">Try Rock →</a></p>
<h3 id="bass-simple">
Bass: Simple
<button class="anchor-copy" data-id="bass-simple" title="Copy link to this section">
#
</button>
</h3>
<p>Sparse, less motion. <a href="./?bass=simple" class="try-link">Try Simple bass →</a></p>
<h3 id="bass-busy">
Bass: Busy
<button class="anchor-copy" data-id="bass-busy" title="Copy link to this section">
#
</button>
</h3>
<p>More motion than Simple. <a href="./?bass=busy" class="try-link">Try Busy bass →</a></p>
<h3 id="drums-simple">
Drums: Simple
<button class="anchor-copy" data-id="drums-simple" title="Copy link to this section">
#
</button>
</h3>
<p>
Sparse drum pattern. <a href="./?drums=simple" class="try-link">Try Simple drums →</a>
</p>
<h3 id="drums-busy">
Drums: Busy
<button class="anchor-copy" data-id="drums-busy" title="Copy link to this section">
#
</button>
</h3>
<p>
More active drum pattern. <a href="./?drums=busy" class="try-link">Try Busy drums →</a>
</p>
<hr />
<h2 id="voicing">
Voicing
<button class="anchor-copy" data-id="voicing" title="Copy link to this section">#</button>
</h2>
<h3 id="voicing-root">
Root
<button class="anchor-copy" data-id="voicing-root" title="Copy link to this section">
#
</button>
</h3>
<p>
Every chord in root position. Clearest chord identity; easiest for ear training.
<a href="./?voicing=root" class="try-link">Try Root voicing →</a>
</p>
<h3 id="voicing-lead">
Voice-lead
<button class="anchor-copy" data-id="voicing-lead" title="Copy link to this section">
#
</button>
</h3>
<p>
Each chord uses the inversion closest to the previous chord. Flows continuously across all
chords and across Cycle laps.
<a href="./?voicing=voice-lead&cycle=4ths" class="try-link">Try Voice-lead →</a>
</p>
<h3 id="voicing-loop">
Voice-lead / loop
<button class="anchor-copy" data-id="voicing-loop" title="Copy link to this section">
#
</button>
</h3>
<p>
Voice leading within each iteration, resets to root position at the start of each Cycle
lap. Same as Voice-lead in Loop mode.
<a href="./?voicing=voice-lead-loop&cycle=4ths" class="try-link">Try Voice-lead/loop →</a>
</p>
<hr />
<h2 id="progression-syntax">
Progression syntax
<button
class="anchor-copy"
data-id="progression-syntax"
title="Copy link to this section"
>
#
</button>
</h2>
<p>
The progression input accepts space-separated tokens. Roman numerals and absolute chord
names can be freely mixed.
</p>
<div class="table-wrap">
<table class="syntax-table">
<thead>
<tr>
<th>Type</th>
<th>Examples</th>
<th>Notes</th>
</tr>
</thead>
<tbody>
<tr>
<td>Major triad</td>
<td><a href="./?section=I+IV+V" class="try-link">I IV V →</a></td>
<td>Uppercase Roman numerals</td>
</tr>
<tr>
<td>Minor triad</td>
<td><a href="./?section=i+iv+vi" class="try-link">i iv vi →</a></td>
<td>Lowercase Roman numerals</td>
</tr>
<tr>
<td>Flat scale degree</td>
<td><a href="./?section=i+bVII+bVI" class="try-link">i bVII bVI →</a></td>
<td>Prefix <code>b</code> lowers by a semitone</td>
</tr>
<tr>
<td>Absolute chord</td>
<td><a href="./?section=I+IV+Am+V" class="try-link">I IV Am V →</a></td>
<td>Suffix <code>m</code> for minor; mix freely with Roman numerals</td>
</tr>
<tr>
<td>Major 7th</td>
<td>
<a href="./?section=Imaj7+IVmaj7+iim7+V7" class="try-link"
>Imaj7 IVmaj7 iim7 V7 →</a
>
</td>
<td></td>
</tr>
<tr>
<td>Dominant 7th</td>
<td><a href="./?section=iim7+V7+I" class="try-link">iim7 V7 I →</a></td>
<td>Uppercase numeral + <code>7</code></td>
</tr>
<tr>
<td>Minor 7th</td>
<td><a href="./?section=iim7+V7+Imaj7" class="try-link">iim7 V7 Imaj7 →</a></td>
<td>Lowercase numeral + <code>7</code></td>
</tr>
<tr>
<td>Diminished triad</td>
<td><a href="./?section=I+viidim+I" class="try-link">I viidim I →</a></td>
<td>Also <code>°</code></td>
</tr>
<tr>
<td>Augmented triad</td>
<td><a href="./?section=Iaug+IV+I" class="try-link">Iaug IV I →</a></td>
<td>Also <code>I+</code></td>
</tr>
<tr>
<td>Suspended</td>
<td><a href="./?section=Isus4+I+Vsus4+V" class="try-link">Isus4 I Vsus4 V →</a></td>
<td></td>
</tr>
<tr>
<td>Half-diminished</td>
<td><a href="./?section=iim7b5+V7+i" class="try-link">iim7b5 V7 i →</a></td>
<td>Also <code>ø</code></td>
</tr>
<tr>
<td>Fully dim 7th</td>
<td><a href="./?section=viidim7+I" class="try-link">viidim7 I →</a></td>
<td>Also <code>°7</code></td>
</tr>
<tr>
<td>Minor-major 7th</td>
<td><a href="./?section=imMaj7+iv+i" class="try-link">imMaj7 iv i →</a></td>
<td></td>
</tr>
<tr>
<td>Dom 7 suspended</td>
<td><a href="./?section=V7sus4+V7+I" class="try-link">V7sus4 V7 I →</a></td>
<td></td>
</tr>
<tr>
<td>Per-chord bars</td>
<td><a href="./?section=I%3A4+IV%3A2+V%3A2" class="try-link">I:4 IV:2 V:2 →</a></td>
<td>Append <code>:n</code> to any chord</td>
</tr>
</tbody>
</table>
</div>
<p>
Repeat a token to extend its duration: <code>I I vi V</code> gives I two iterations at the
default bar count. Chord chips show resolved names and highlight during playback.
</p>
<hr />
<h2 id="sections">
Sections & arrangement
<button class="anchor-copy" data-id="sections" title="Copy link to this section">
#
</button>
</h2>
<p>
Build song structure with multiple sections. A single section (the default) just loops.
</p>
<h3 id="sections-list">
Sections
<button class="anchor-copy" data-id="sections-list" title="Copy link to this section">
#
</button>
</h3>
<p>
Each section has its own <a href="#progression-syntax">progression</a>. Reorder with ↑↓,
delete with ×.
</p>
<h3 id="arrangement">
Arrangement
<button class="anchor-copy" data-id="arrangement" title="Copy link to this section">
#
</button>
</h3>
<p>
An optional sequence of section numbers that controls playback order —
<code>1</code> means section 1, <code>2</code> means section 2, and so on. Leave it empty
to play all sections in order.
</p>
<p>
For example, <code>1 1 2 3 2 3</code> plays section 1 twice, then alternates sections 2
and 3 twice. Append <code>:n</code> to repeat a section multiple times:
<code>1:4 2:2</code> plays section 1 four times then section 2 twice.
</p>
<a
href="./?key=C&tempo=100&bars=1&cycle=none&style=rock&bass=simple&voicing=voice-lead-loop§ion=vi+IV+I+V§ion=vi+iii+vi+iii+vi+iii+V+vi%3A2§ion=iii%3A2+I%3A2&arrangement=1+1+2%3A2+1%3A2+3%3A2&advance=auto&chordVol=50&bassVol=100&drumVol=100&masterVol=100&chordsOn=1&bassOn=1&drumsOn=1"
class="try-link"
>Try 3-section song →</a
>
<h3 id="auto-manual">
Auto / Manual
<button class="anchor-copy" data-id="auto-manual" title="Copy link to this section">
#
</button>
</h3>
<p>
Auto advances sections automatically. Manual holds the current section until you tap the
SONG scrubber.
</p>
<h3 id="song-scrubber">
SONG scrubber
<button class="anchor-copy" data-id="song-scrubber" title="Copy link to this section">
#
</button>
</h3>
<p>Appears in the action bar when the arrangement has two or more steps.</p>
<ul>
<li>
<strong>While playing</strong> — tap a segment to queue a jump to it; takes effect after
the current section completes. Tap again to cancel.
</li>
<li>
<strong>While stopped or paused</strong> — tap a segment to set where playback will
start.
</li>
</ul>
<hr />
<h2 id="presets">
Presets
<button class="anchor-copy" data-id="presets" title="Copy link to this section">#</button>
</h2>
<p>
The preset pill in the top-left corner shows the currently loaded preset. Tap it to open
the preset menu.
</p>
<h3 id="starter-presets">
Starter presets
<button class="anchor-copy" data-id="starter-presets" title="Copy link to this section">
#
</button>
</h3>
<p>