Billie Tracker

Billie Tracker is a groovebox: a step sequencer, synth instruments, a sampler and a mixer, built as one instrument for your phone or tablet.

You write music in a grid. Notes go into patterns, patterns chain into sections, and sections line up into a song, so a full track grows out of small pieces you can reuse and rearrange. Trackers have worked this way for decades. If you have used one, this will feel like home. If you haven't, a built-in tutorial walks you through your first pattern, and every screen has help one key away.

It is not tied to one sound. Shape the synths from clean tones to heavy drive, sample anything and play it back as an instrument, and make whatever you want to make: techno, ambient, hip hop, pop, or the 8-bit styles trackers are known for.

Rows hold up to eight notes, not just one. Every instrument is polyphonic, so a chord goes into the grid the same way a single note does. Hold one on a MIDI keyboard and it lands across the row's note lanes, quantized and in key.

What you get:

- A step sequencer for notes, instruments, volume and effects, with chains and a song view for arrangement
- Up to eight note lanes on every row, so chords are typed in like single notes, on any instrument
- Synth instruments you can shape: timbre, color, filter, drive, envelopes and LFOs
- A sampler that records straight into the app, so your own sounds sit next to the synths
- A mixer with per-track levels and sends
- BOUNCE and STEMS, so a finished song leaves the app as audio
- Bundles: a song and every sample it uses travel as one file
- A control surface built for tracker speed. Hold one key, press another, fast. Rearrange the layout to fit your hands, or plug in a hardware keyboard or game controller
- Themes, KEY and SCALE settings, and a HELP key that explains whatever you are looking at

Your songs are ordinary files. There is no account and nothing to sign into. Send a song to a friend, email one to yourself, or move it around in your file manager. Nothing is uploaded to us and nothing is locked to us.

Billie Tracker is made by Billie Workers' Co-op. The people using it steer what gets built, and the Discord is the fastest way to reach us.