Lots of reasons why but why make this post longer than it needs to be???
I have a Roland XV2020 that I used when I experimented with midi guitar. I very much like the existing sounds it can produce. I learned a lot about the things in midi that applied to midi guitar and not much else. What I want to do is take an existing midi file (cover song) and with some sort of midi player/editor be able to play this file through my XV2020 and be able to access all of the available internal patches. Typically, this would mean reassigning all of the instruments. Is this possible? I've tried to understand this by reading the Roland manual but I just don't have the insight. I can do this with General Midi patches when using IOS apps like Cubasis and Sweet Midi but these are either free or inexpensive apps and I suspect that if it is possible, I may need to purchase a fairly expensive app. That would be okay but I don't want to take the leap only to find that it can't be done.