FingaMIDI is a free, open source, replacement driver for the ADB trackpad found in the Apple G4 Ti PowerBook and probably the Snow iBook, G4 iBook and aluminium PowerBooks. It allows the inbuilt trackpad to be used as a three-axis MIDI controller, sending x, y and z (pressure) data as parameter change messages.
Its still at the beta stage just now; I am waiting for feedback on which models of iBook/PowerBook it will actually work on before I push for a final release.
You can find it at http://fingamidi.sourceforge.net/
cheers
Stu Yarrow ------------------------------------------- stu AT outpost.org.uk http://www.outpost.org.uk/ http://fingamidi.sourceforge.net/