I wanna take the drum MIDI file from guitar pro and transfer it via MIDI cable to my alesis sr-16, is this at all possible?
if your Alesis can load MIDI files it should be possible, but guitar pro has some weird MIDI clock issues sometimes so it might not sound right.
I'm going to say no. The step-based internal sequencer of the SR-16 will probably get royally f***ed up by the MIDI control messages sent by Guitar Pro. You can remove them in any sequencing software if need be but at best I think what you can do is control the SR-16 via MIDI, you won't be able to "export" the MIDI to the SR-16 (partly because it works on patterns).