Hello,

It seems that BIAB wants to play all the instruments on Channel 1 and so all instruments have the same sound.

I noticed that if I go to Options - MIDI Settings I see that instead of having:

Bass: Channel 2
Piano: Channel 3
etcetera

I have
Bass: Channel 1
Piano: Channel 1

I tried a reinstall, a reset to factory settings and deleting the content of the Preference folder, but they didn't work.

This happens not only if I open an old song but even if I make a new one. If I change the channels manually the song plays fine, but when I start a new one all the channels go back to 1.
I never messed up with any settings so I really can't understand why this happens.