Hi Danna.

This is an unusual issue.

First a bit of background... When you load a MIDI file into BIAB, the entire MIDI is loaded onto BIAB's Melody track (using terminology from older versions of BIAB). This MIDI file then resides on BIAB's Melody track as a multiple channel MIDI (i.e. all the MIDI tracks in the MIDI file are loaded onto this one BIAB location).

BIAB's Melody track is the sixth track down from the top in the mixer. Because BIAB automatically names tracks using instrument names, these days, your sixth track from the top might not be named "Melody". What I have written below, though, still applies whatever the name.

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When a BIAB song-file that has a melody track with multiple channels instead of just a single channel, the song-file is automatically saved with the MGX extension. The MGU extension is reserved for a song-file that has a single channel on the Melody track.

When you say that you muted the Melody track in the sequencer, I'm not sure if you mean that you have muted the Melody channel in the multiple channels or if you muted BIAB's Melody track. If you have muted BIAB's Melody track, then the MIDI file won't be heard because you have muted the entire file (which was automatically loaded onto BIAB's Melody track).

Try unmuting the Melody track and see if your sound returns.

Regards,
--Noel

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Audiophile BIAB 2025