I finally figured it out!
I just decided - what the heck, I'm just going to check and uncheck any boxes in BIAB that have to do with midi and hope something works.
It turns out that under Options>Preferences>Midi Options, when the box opens up and I uncheck "Output Sync/Start Info", my "unwanted sound" goes away.
Last edited by terriandralph; 06/29/19 09:16 AM.