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The board has five line inputs and one tape input with tape monitor function. There is also a mute function and outputs for two extra relays - one power relay (perhaps for swicthing the amp on/off), and a spare relay output with no fixed function. The volume is controlled using a motorized pot.
The board can be used either on it's own as a "passive preamp", or it can be used as an input selector in a pre- or poweramp.
The kit does not include the motorized pot - the board is designed for Alps RK27 pots. You can see what values I have in stock on the "Accessories" pages. You will also need a power supply (6-12V AC or 7.5-15V DC 500mA). If you don't have one available, you can also find those on the "Accessories" pages.
The "InputVol1" and "Control1" boards can be bought as a set - see the "Remote4" kit.