http://www.sonuus.com/products_i2m_mp.html
If you think pitch-to-MIDI isn't for metal -- think again!
Mat from DESTRAGE, shows what you can do with the Sonuus i2M musicport converter, Garage Band and some great musicianship.
The i2M musicport is an ultra-fast monophonic MIDI converter for guitar and other instruments. It also includes a Hi-Z USB audio interface to give you an easy way to connect your musical instruments to your computer.
Apple's Garage Band was used for MIDI sounds and tracking.