4wheel, thanks for offering to help.
I’m kind of MIDI illiterate but it appears that after modifying the file, the the midi map seems to change so that the commands don’t trigger the same response. For instance the base notes became drum beats.
The original file I was using is: GET TOGETHER (OPBk) 1.1 - THE YOUNGBLOODS from Phil.
The author of the files, Phil, was kind enough to include a couple of .mid files in addition to the .sng file. When I pulled the Midi file into Studio One the DAW found appropriate instruments and played the file fairly accurately. After I modified some velocities or removed a couple of the instruments and then put the file back into Midi format, the part played by the base now seemed to be played by the drums. I even put Phil’s .mid file into the BBM and it played just like his .sng file so there was no corruption there.
Here’s a link to a google drive file with the altered midi file: [https://drive.google.com/file/d/10zVtxHDUChMJzD5_G0f2DAYL6_yPvUrr/view?usp=sharing ] if you want to look at what happened.
Persist had a look at the file and thought I needed to lower the notes in the base track by 2-3 octaves to make them work but he doesn’t use Studio One and I’m hoping for a simpler way to work on the .mid files to either remove instruments I don’t want in the final file or alter velocities (usually lower) for use with my duo.
Thanks again for any help you can send my way.