We simply don’t go by any official schematic for expression pedals. Since we don’t manufacture them we just recommend a 10 kohm to 25 kohm linear potentiometer. Keep in mind the EXP ports on the H90 are NOT able to provide expression and footswitch functionality on the same port the way H9 can. You’ll have to output expression to EXP1 and footswitch functionality to EXP2.
