Au 303, Need some help Options

[tomc11]

Sounds silly maybe but I started playing with Airy's AU303 toy and found it has some interesting sounds. I would like to understand it better but can't find any help info on it. I see the knob to change the pattern to the next one but can't figure out if how to set it up.
Does this also have a "Song" mode like iDrum where you can have it jump from pattern to pattern. Or, is that knob even addressable from my midi keyboard. Can't get that to happen either.
One other question: Can't seem to bring it up thru Garageband3. It works great through the Rax AU manager w/ iDrum and a synth even on the Mac-Intel so I know it's set up right - but can't find it in GB3. Any ideas?