How can i set up toneport to use it as a sound card with itunes and guitar pro. I cant seem to figure it out
...what midi?

the Toneport works fine in a program called Reaper or Cakewalk Sonar which use MIDI as well as audio.

The toneport is only an audio interface and doesnt have MIDI connections although you can do what I did and get a MIDI to USB cable...
guitar pro...isnt that a MIDI only program?

if so, you need a USB to MIDI interface to get the sound out and into that program.
although i have not used it much since I don't run with much MIDI gear. I'm sure someone else who has used it before will chime in soon enough.