This is a Boss FV-200 volume pedal, designed for use with keyboards. Can also be used to control other remote applications e.g. VCF on a synthesiser. 200k ohm resistance. Circa 1984.

Two discretely separate stereo channels are controlled at once for use with stereo instruments. Centre point setting spring can be used to set a normal volume level during performance with 6-8dB extra gain available.

In fair, working order!

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