Roland GO:MIXER PRO-X Audio Mixer for Smartphones - Manual (Page 8)

to
beginning
Adjusting the Volume
Adjust the knob so that the PEAK indicator lights
briefly when your performance is loudest.
GUITAR/
BASS *2
MIC
INSTRUMENT
(L/MONO, R)
HEADSET
MIC PEAK
If this stays lit, the
sound is too loud.
HEADPHONE/
SMARTPHONE OUT *1
8