The patch volume knob (shift+attack) is probably the knob I use the most. Too bad I need to hold down the shift button 
Is there a way to invert the two or use some other knob ?
I can'tuse an external midi controller as I need it to change the volume of the active part (seq mode). Or is there some CC that will control the active part (not channel specific)?
I also tried with a boss fv-500L pedal but my TI2polar makes only very small volume changes. Is there a way to calibrate the CTRLpedal on the TI2 ?