Got busy and lost track of this thread. Very happy you got it fixed. I never try to do any kind of editing in Biab, it's all in RB. I've written extensively about how Biab is great for putting a song together quickly just to get an idea about how it can sound but after that it's all RB for me. RB is a full DAW, Biab isn't they're two different programs and lots of folks think that RB is just another version of Biab, not true.

The fact the offending tracks were generated by the Melodist is interesting. I saw a couple of other posts complaining about something the Melodist did. I never use that so can't comment on it.

All I can say is midi can be totally baffling at times. Like you I've downloaded gazillions of midi files and I've put some into a Test folder because in spite of what I know, I simply cannot get them to play correctly. I've copied them, tried stripping out everything I can find yet the instruments are still wrong. There's something hiding in those files that I cannot find.

We have no idea what the original author did and then since this is the internet those files could have been changed by someone else or even several someone's. When you go looking for sysex and other data info sometimes a file will have all of that on a separate track that has no instrument data. Somehow the instructions in that data track works on all the other tracks. Other times the data instructions are embedded in a regular instrument track or spread out over several instrument tracks. Very confusing.

Like you said some of those files are really excellent as far as the performance is concerned yet will not play correctly. If you really want to use one of those you can do a cut/paste of just the note and performance data into a new blank RB project and get it to work that way. Very tedious though if you've got say 23 tracks to copy.

When you do that RB calls it a scrap clipboard. Weird I know but it allows you to copy/paste data from one project to another. When you go to copy something a window opens that allows you to make choices of exactly what you want to copy. Check that out.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.