Mmh. As a Test, I just loaded a known ALL-MIDI old BiaB file of mine into RB.
All tracks come up fine and play fine!!
I notice that each track has "Channel" identifier number that seems to have NO relationship to the track number it is on.
On the RB I'm having trouble with, it says "Ch 0"? Is that a REAL channel
It might not be the reason I cant hear it - or it might be.

Old Guys Rule.The older I get,the better I was!
BB2023 ULTRA, 1013, Win 7 and 10

ALL TRACKS - https://app.box.com/s/501rnzrbadng1elvi45hbf7y08kl5oxp
SOUNDCLOUD-tracks using BB-
http://soundcloud.com/sixchannel
Videos-
https://youtube.com/user/Sixchannel1