To add what Rachael said, a song starts as an SGU file with just the [up to] five accompaniment tracks (drums, guitar, bass, piano, and strings); however, as soon as you add anything to the soloist or melody track, it will get saved as an MGU.

The "U" is for "User". You may find some files on the internet that end in a number or a different letter than "U". These are in the original file format (still supported), in which the last letter/number indicated which of the BIAB built-in styles was used in the file. The default now is to save everything as either MGU or SGU, but you can still save as MG1 or SG8, depending on the style selected. This applies only to the built-in styles, which start with ZZ in the style name.

There is also an MGX file, which indicates that there is a multichannel MIDI data on either the melody or soloist track. So if you load a MIDI file into BIAB, it will give it an MGX extension.


I hope that made sense.

John

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