[matheusmoreira]

Music trackers are so cool. Instead of recorded audio, they produce modules which are essentially programs that the tracker software executes to reproduce the sound. You can even see the unmixed waveforms of each instrument being generated in real time. It's just so cool to watch.

https://youtu.be/eclMFa0mD1c

[chromoblob]

Meh, they are unlike programs. Rather, they are grids of notes and special commands that alter the pitch, velocity or timing, together with a bunch of samples and envelopes used to play those notes. Some formats also have simple filters for subtractive synthesis. Modern tracker-based programs, though, have capabilities for complex signal synthesis/processing (Renoise, Sunvox).