This could probably be made with a script like
CSVQF Multiple Search, Play & Inject Biab Styles
If could search a folder for SGU/MGU, play all or selected in order.
Biab would need to use the the system audio so you can get the VU Level, so when no VU it will load next song, or move to next song with hotkey or foot switch.

It could mute a track by sending the hotkey for that track as long as this is the same instrument track in each song.
Muting Tracks
Alt+2 Mute all tracks.

Alt+3 Mute the Bass track.

Alt+4 Mute the Piano track.

Alt+5 Mute the Drums track.

Alt+6 Mute the Guitar track.

Alt+7 Mute the Strings track.

Alt+8 Mute the Melody track.

Alt+9 Mute the Soloist track.

Alt+0 Mute the Thru track.