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BackMount. \*\* Use only four (4) potentiometers, either 9 mm vertical board mount OR: | | | | | R1, R2, R23, R24 R3, R21, R27, R28 R4, R6, R7 | 3 | 22k | Resistor | | D1, D2, D3, D4, D5, D8, D9, D10 Standard switching diode, DO-35"/>