http://www.open-tuning.com/
Alternate download: Open Tuning.sit (1.3 MB)
Welcome to "Open Tuning", the only Midi utility for Mac OS X offering to midi and midified polyphonic instrument players (guitarist, bassist, violinist, etc) the ability to play and explore an unlimited number of virtual open tunings without the need to retune the instrument each time.
System requirements
• Any Apple computer running Mac OS X 10.2 or later
• Midi USB or Midi FireWire interface 1x1 minimum
• A free USB or FireWire port to connect the Midi interface
External equipments
• All midi instruments
• All acoustic, electric or electro-acoustic instruments equipped with a polyphonic pickup
• All instruments equipped with analogic sensors to be midified
• Audio to Midi convertor interface
Supported hardware
• Interfaces: Axon 100, Photon, Roland GI 10 and 20, Zeta Synthony II, Yamaha G50
• Interfaces with built-in synth: Axon 100 SB, Roland GR synth line, Zeta Synthony II