Pocket Composer

A four-track step sequencer with a piano-roll grid, transport, track mutes and a visible playhead.

Run it

Build examples with devenv shell -- lcom-ng-build, then:

lcom-ng run -- build/examples/music_maker build/pattern.mlpat

Controls

Control	Action
Space / P	Play or pause
Click / arrows + Enter	Write or toggle a note
1-4 / Tab	Select instrument
M / track M button	Mute selected track
- / + or transport buttons	Change tempo
Backspace / Delete	Remove current note
C / R	Clear track / restore demo pattern
Cmd/Ctrl+S / S / F2	Save pattern
Cmd/Ctrl+Z / Cmd/Ctrl+Shift+Z (Ctrl+Y)	Undo / redo
F1	Shortcuts

In the app

One loop, four voicesThe piano roll separates the active voice from the other tracks, with a compact pattern overview below.

Shape the bass lineNumber keys select instruments and the lane overview exposes every track.

A rhythm of its ownThe drum lane can be edited with the same mouse and keyboard controls as melodic voices.

Hear the whole loopSpace starts real AC97 audio playback with a visible step playhead.

Make room in the mixMute is visible on each instrument and changes the audio that is actually rendered.

Start a new partClear removes only the selected instrument; Undo restores the previous pattern.

Keep the compositionCommand-S saves a reloadable pattern including tempo and mute states.

The complete control mapThe modal help lists writing, transport, history, persistence and tempo controls.

1 / 8

One loop, four voices · The piano roll separates the active voice from the other tracks, with a compact pattern overview below.

What it demonstrates

PIT timing, keyboard and mouse handling, AC97 audio, PCM buffers, note sequencing and pattern persistence. Pattern files store notes and tempo, not recorded audio.

Source: examples/music_maker.c.

Refresh captures with the screenshot workflow.