Zoom A3 Operation Manual page 5

Mic gain knob
Display
Pickup gain knob
Effect switch
Boost footswitch
Boost switch
BALANCED
OUT connector
POWER (eco) switch
Right Panel
GROUND switch
Use this switch to connect or disconnect
the BALANCED OUT connector with the
ground.
Set it to "LIFT" (pushed in) to separate
the signal path from the grounding pin.
Set it to "CONNECT" (not pushed in) to
connect it to the grounding pin.
Pickup input jack
Acoustic Guitar
Pickup type selection switch
Use to set the best input characteristics
for the type of pickup used.
Set it to PIEZO when using an acoustic
guitar with a piezoelectric pickup or
MAGNETIC when using a magnetic
pickup. You can also set it to FLAT if you
do not want any pickup adjustment.
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