10. Indicator LED This LED indicates when the effect is turned on. If the LED becomes dim or does not light when the cables are connected, the battery needs to be replaced. 11. Out 2 (Effect) Jack Connect this output to a second amplifier or to a mixer channel for effect signal only. When Out 2 is connected, only effect signal is present when the Bass Synth Wah is turned on. Out 2 is muted when the Bass Synth Wah is bypassed.