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Back** Use only four (4) potentiometers, either 9 mm vertical board mount. Only 16 mm vertical board mount | | | R21, R22, R23 | 3 | AudioJack2 | Audio Jack, 2 Poles (Mono / TS), Switched T Pole (Normalling) | | | | U1 | 1 | TL074 | Quad Low-Noise JFET-Input Operational Amplifiers, DIP-8/SOIC-8/TO-99-8"/>