Vic Tracker is a music editor coded by Daniel Kahlin and runs natively on the Commodore VIC_20 released under the BSD-license.

From the website -- "VIC-TRACKER is a full-featured tracker-style music editor for the Commodore Vic-20. It includes a cross-compressor which produces compact assembly source code output suitable for inclusion in demos and games. As of version 2.0 VIC-TRACKER also supports Sync24/DIN-Sync making it easy to synchronize it to modern sequencers and electronic music hardware such as drum machines.

Note: To run VIC-TRACKER you need at least 16KB expansion memory, but compiled songs normally work on unexpanded machines."

The cross-compressor(compiler) is just a source code for *NIX systems (??not really sure??) and requires building before your saved tracker modules can be converted to a stand-alone VIC20 executable.

Vic-Tracker 2.0