I was trying to find out how in reaper to assign the midi tracks to Windows GS Wavetable Synth and then bounce them down, even when I managed to change each midi track to a different instrument it would still bounce them down as piano - very confusing...
I've managed to resolve the issue (used another program to separate instruments and bounce back down into a new midi, that's not all piano

I just wanted to thank everyone for their input with this, you guys have been helpful as usual... I definitely do miss frequenting this forum as much as I used to a couple years back!
B