The Moan effect has been specifically designed for heavy distortion situations - although it can be used in all situations - the moan effect will be most apparent when using a heavier distortion. The effect can sometimes be subtle depending on the natural harmonics of your guitar or bass.
The best way to “tweak” your moan sound is to set your amp with a little light distortion (crunch). Turn on the moan effect and, while constantly
striking the “E” or “A” string, turn the “MOAN” knob. You will hear a frequency shift as the MOAN moves through the various natural harmonics in your guitar/bass. Once you have found the desired harmonic stop turning the knob. There is no “wrong” setting - it will be different depending on the desired sound you are looking for. Every guitar/bass has different harmonic capabilities - thus you will have to experiment with this.
Here is a list of options that you have with the COMBINE MOAN/WAH SWITCH:
SWITCH MOAN WAH
On On On
Off On Off
Off Off On
Off On On
Off Off Off