Hi,
I am on iOS 8.4.1 with Casio XW Midi Designer 1.7.1 Build 1714.
The problem is that the Amp Touch Sens(itivity) Knob ,send wrong midi message. For Syn1 eg it sends
B0 63 30
B0 62 2A <--It should be 2B instead according to midi chart
B0 06 xx
Could you check that?