Emax

Is it possible to midi it thru the computer and have playback, while 
sequencing on software. E.g. Drums sampled through the keyboard and 
notes being played off the computer at the same time, and the keyboard 
used as a controller also. Are these techniques possible. I have 
another question how good is the scratch pad? If anyone could help me 
out on this I'd appreciate it thanks a bunch.