Quote:

The programs (both RB and BiB) seem unstable in their patch assignments – I find that there are impromptu reassignments of patches that seem to occur spontaneously (though I'm sure I must be initiating these, I can't figure out how).



The problem Chris is you don't understand midi at all and believe me it can be very confusing at first. Do what Rharv asked and post exactly how you have your PC set up especially in the midi output window.
To answer your exact problem above, it could be midi commands embedded in the midi file itself. This alone is a very confusing part of working with midi files. Whoever created that file put midi patch changes in that file on a per track and per channel basis. If you're having problems with a patch suddenly changing ostensibly on it's own, it almost certainly involves an embedded patch change. Is the midi file in question one you downloaded? How did you acquire it? The big thing about midi is not all midi files are created equal. There's something called sysex that is a string of commands designed to work with one particular synth. A lot of files on the internet have that and if you don't have the exact same synth the author used in the first place, it won't sound right. Now, you can go into that file and strip that stuff out and put your own commands in but many times it's easier to just find another version of the tune that does play correctly with your set up.
Man, already I'm starting to write a book. Anyway, tell us more about your set up, we'll figure it out. Your Roland is a great keyboard and will sound very good with midi files, you just have to get it set up right. Once that's done, you usually don't have to mess with it too much. Start with one thing, put your Roland into GM mode. Your manual will tell you how to do that. Just that alone will solve a lot of your problems. Once you have that working, we can get you to where you can use the rest of your patches.

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.