It’s best practice to connect to an expression pedal or aux switch first before connecting to either input. This way the H9 can accurately sense the load. To calibrate an expression pedal on the H9, enter the System Menu and choose I/O. On the third page of settings, we find the Calibration section featuring indicators for the pedal sweep and circles that light up when switches are pressed. When Calibration is set to ON with the third quick knob move the expression pedal from heel to toe until the display shows a zero to 100 sweep range ensuring proper detection. If the sweep behaves erratically or goes up and back down again, check to make sure you’re connecting to the H9 with the appropriate cable. Some expression pedals only work with a TS cable, others use a TRS cable. Also, watch out for any internal dip switches or extra potentiometers. Some expression pedals use them to reverse the direction of the sweep or adjust the pedal’s response curve. Eventide recommends expression pedals with a 10 Kiloohm – 25 Kiloohm linear potentiometer. While higher ratings work, it may cause the range to be compressed at one end of the pedal sweep. It’s best to stick with this recommendation. I know the Ernie Ball has two versions of of VP JR, one that has a 250K (6180) pot and another that is 25K (6181), make sure it’s the latter.
