#1
I know the basics on it but i want to know what really is for.
GEAR

ESP LTD F-155 DX BASS
Epiphone Thunderbird bass
Samic cr1 bt bass

Dunlop bass crybaby
Ibanez PD7 Bass Overdrive Pedal
Boss bass chorus
Zoom 607 multy effects pedal

Ashdown 180 watt bass amp
Mega 30 watt

METAL UP 'UR ASSS
#2
its a VU meter. it measures how strong of a signal is going into the amp. i usually try to have mine between 7-5
I play bass!