The 3 LEDs on the front panel are there to help with this adjustment. These LEDs signify the following:
1. The green “Sig” LED indicates the existence of signal and should be lit as long as you are playing into the device.
2. The orange “Nom” LED indicates healthy nominal levels and should be lit occasionally according to the dynamics of your playing. If it is mostly off and only turns on for the very peaks f your performance, you may want to boost the trim a little. If “Nom” is mostly on, even on long sustained notes, then the signal may be a little hot and you need to keep an eye out for the next (red) LED.
3. The red “Over” LED indicates that the signal is overloading and clipping is occurring. If this happens more then rarely, then take the trim down to the point where it almost never lights up.
For more information on how to obtain best results when using the WPGI, please keep reading.
Guitar in: ¼” jack guitar input
Gain: Input level adjustment knob
Level: 3 LEDs indicate the input level
Low Batt: This LED indicates the battery power
On: On/Off LED indicator
Waves Guitar Tool Rack User Guide.