If the expression pedal is plugged in, the Amplifire treats the Volume as 0% until I move the expression pedal a bit. Verified this by looking at the on device "Vol Pedal" % parameter. As soon as you turn it on, the reading is 0% no matter the pedal position at power on. Just touch the pedal a bit and it jumps to the expected value. Doesn't seem to matter if the env src is set to guitar or volume input. Also disabled the expression 1 for the wah; didn't help either. Note. if the expression pedal is not plugged in at power on and later plugged, then this behavior is OK, but not required.