I've uploaded a new version of farmpad which should hopefully fix the problems PPC users had with the earlier version, and also has a config option so you can define controller and channel numbers, mix different trigger modes and assign notes to pads and switches.
I figured I'd start a new thread for this version as it hopefully clears up the problems you all were having in the old one.
Sorry I've been away from the forum for a while, and that this took so long! I don't know what to say, other than this took much longer than I expected, and thanks for your patience.
Get it here: http://farmaudio.com/farmpad
It should work on Intel and PowerPC macs running 10.4+, although I don't have the means to test it. If it works on your machine please let me know