Boss FV-50H Stereo Volume Pedal 

The high-impedance FV-50H is designed to be connected before guitar effect units in the signal chain.

Features:

• Low-impedance FV-50L enables direct control of stereo keyboards and stereo effects units
• High-impedance FV-50H designed for connection before guitar effects units
• Minimum Volume knob lets users set minimum volume as desired
• Convenient Tuner Out jack enables speedy tuning on stage