The Commodore VIC-20 was an 8-bit home computer first released in 1980. The "Video Interface Chip" (MOS Technology 6560/6561) was responsible for both the audio and visual graphics of the machine. On the audio side, the VIC chip had 3 square wave channels and 1 white noise channel and a global volume control. Each square wave had a range of 3 octaves, but were tuned an octave apart from each other. This gives the chip a five octave range total.
How to make VIC-20 music
mod2vic
Compose your music in any Fasttracker compatible editor, then convert it to .prg with this Python-based utility by cce.
VIC-Tracker 2.0
The classic way of doing things. A real tracker running on real hardware (or in an emulator), made by Daniel Kahlin. Slightly unnerving because it does not use note names.
VIC Duzz It
Another tracker that runs on the actual machine, made by Glenn Rune Gallefoss. More complicated than VIC-Tracker, but also more advanced. Unlike VIC-Tracker, it requires full memory expansion.
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