http://www.youtube.com/watch?v=9FMm6PMPHoo 
Available for the Slim Phatty and coming soon for the Little Phatty with OS
v3.0, this free download makes experimenting with alternate scales a breeze.
Tuning data is easily editable and is displayed as a ratio, frequency and in
cents. Scala files (
http://www.huygens-fokker.org/scala) can be imported and
exported for use with other tuning software. An unlimited number of tunings
can be saved on your computer and the synthesizer's hardware can store up to
thirty-two different tunings; enough to take you around the world and back
again.