Hercules DJCONTROL INPULSE 500 Mode D'emploi page 21

5.4. Hardware mixing: inputs and outputs
Microphone input
MIC VOL: controls the microphone volume (hardware adjustment).
Light ring: off = no audio signal / green = audio signal / red = audio signal
saturation.
2-band EQ: lets you adjust the HIGH (treble) and LOW (bass) frequencies for the
microphone.
Aux (auxiliary) input
AUX VOL: controls the volume for the Aux input (hardware adjustment).
Light ring: off = no audio signal / green = audio signal / red = audio signal
saturation.
AUX FILTER: filter for the Aux input.