Hey experts, what is the CHEAPEST route to finding a midi keyboard that I can use to trigger my Alesis SR16 drum machine? Will the little cheapies in Wal Mart do the trick? I would like to have the velocity/aftertouch abilities, but they aren't absolutely neccesary. Reason is, I bought the SR16 new, and I think the trigger pads on the front ABSOLUTELY SUCK , so I thought if I could pick up a cheapie keyboard, maybe I could do some real rolls and stuff. It is impossible to do anything other than basic beats on my SR16. Any suggestions on a keyboard? Or should I just chuck the SR16?? Rock On, bOb