forums.ps2dev.org

try this http://www.psp-programming.com/forums/i ... &topic=727 precompiled environment or

http://www.psp-programming.com/forums/i ... 6&topic=62 cygwin psp setup in 10 easy steps

also try doing the tutorials here. They show you how to open and read the contents of a file.

Youll then need to read up on arrays, and strings. I think if you open both files and read the contents into 2 arrays then compare them you will accomplish what ya need.

forget about usb check this out. I personally use ableton live and this is the ultimate homebrew to me. wireless controller for ableton. So i would assume its possible to make one to control other midi programs also. Here is link to the page.
http://e-mu.org/?p=20