" I'll probably sell it to one of my friends."
I'd suggest hanging on to it...the sampletrak really becomes powerful when its in play with another sampler. If I were you, I'd fool around with triggering them into eachother, maybe having one to trigger samples and the other to trigger loops and variations in song mode. That way you'll have a lot more flexibility and will probably have even more dynamic tracks.
Btw- is there any chance you'd be willing to provide some wav samples from the atari? that would be wicked!