I am using the Amplitube app on my iPad mini2 with the iRig Blueboard. I also purchased an expression pedal hoping to use it with the app. One major omission to the pedal collection is a volume pedal. There are a couple of wah-wah's (that I have not tried) but no volume control pedal. Could that be added? Not sure if there is any modeling involved but I use an Ernie Ball volume pedal with my non-virtual/physical rig.
Thanks!