YO DT:
The Alesis SR16 has mediocre patches.
Get the Boss 880 Drum box and you can do the programming and your tempo change.
The patches on the 880, all 4 hundred plus, cover many bases and the sound is very good. You can also you the built-in bass line if you want--if not, just leave it turned off. You can also change the key of the patch to suit your needs. For the money, it's the best box I've had yet and I have an SR16 collecting dust.
Kind of funny, once you get a new piece of gear and unplug the old piece of gear, the old one goes into limbo and dust or is donated to a college band.
Green Hornet