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Ernie Ball VP JR with the tuner mod, built in tuner is a TC Electronic Polytune 3
It’s 3 pedals in one, Buffer, Tuner and Volume.
It has separate ins and outs for the tuner section and the volume section, they can be placed anywhere in the signal chain on the pedalboard.
Standard 9V operation.
Pedal is made to always have the tuner on and you have access to all buttons on the tuner including the on off witch for drop d tunings.