.SGU - songs without a melody.
.MGU - songs with a melody.
.MGX - songs with a multi-channel melody track (such as if you had imported a MIDI file with multiple instruments.)

.SG1, .SG2 ... .SGD, etc.

These are legacy file extensions, where the third character was used to indicate that the song used one of the basic built-in styles, like ZZJAZZ, ZZCOUNTRY ("U" stands for User).


BIAB – 2025, Reaper (current), i7-12700F Processor, 32GB DDR4-3200MHz RAM, Motu Audio Express 6x6 - My SoundCloud (Tip: No need to create a SC account to hear music - just hit ESC ).