MOAN ON/OFF LED - When the LED is lit the MOAN effect will be ON. When the LED is not lit the MOAN effect is bypassed. COMBINE LED - When this Red LED is lit the COMBINE function is activated. When the LED is not lit, the COMBINE function is bypassed. COMBINE MOAN/WAH Switch - this switch allows you to apply the MOAN effect to the wah. Here are the two functions of the switch: 1) When COMBINE MOAN/WAH is activated the red LED will be lit. This will apply the MOAN effect to the wah effect which is controlled by the �rocker footpedal�. The MOAN effect will now only become active once the wah is activated by the switch under the toe (see point 2). Please note that in this case, the MOAN must be ON and the green led lit. The purpose of this function is to allow you to setup and establish a MOAN effect and wah sound together so that when you are ready to use it in your song you don�t have to first turn on the moan and then the wah effect - you only need to now activate the wah via the switch under the toe (see point 2) and both the MOAN and WAH effects will be active. 2) When the COMBINE MOAN/WAH is not activated the LED will not be lit. Thus will allow for independent control of the MOAN and WAH effects.