FingaMIDI

FingaMIDI is a free open source driver to allow iBooks and PowerBooks to use their ADB trackpad as a three-axis MIDI controller (x, y, and pressure / for z data).

Development history
FingaMIDI was developed with openly available Darwin source code for ADB devices. However, new PowerBooks released on January 31, 2005 switched to USB trackpads using closed-source drivers, leading to the development of FingaMIDI being halted.

Release history

 * Version 1.0 — March 16, 2004, for Mac OS X 10.2 (Jaguar)
 * Version 1.1 — April 14, 2004, for Mac OS X 10.3 (Panther)
 * Version 1.2 — April 18, 2004
 * Version 2.0 — December 24, 2004

Software conflicts
FingaMIDI may interfere with the functionality of other ADB trackpad drivers, such as iScroll2.