This music module has 4 channels of pattern data. Depending on the format used, more channels may be played simultaneously.

4Q is a merged format of usually seperated Quartet Atari ST musics (.4V and .SET). This format can be replayed on Windows using Jam for Windows 2.1 by Cream.

MOD is the tracked music format used by ProTracker and many compatible tracker applications. This tag also covers variants of the MOD format with identical file structure but more than four channels.

Quartet is a digital music composition program by Microdeal. It combines the sample playing abilities of a tracker with conventional music notation known from MIDI software. The program is named after its 4-note polyphonic tracker. The program was released for Atari ST and Amiga.

SNDH is a container format for all types of Atari 16/32-bit music. It contains music data as well as the native playroutine. This format can be replayed on Windows using Jam for Windows 2.1 by Cream.