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7: TREBLE: Adjusts the high frequency output level: to the left reduces the high frequency output; to the right increases it. 8: INSERT: Connect an external effects device via this jack. Use a stereo 1/4” male Y- cord: ring = send, tip = return, sleeve = ground. Send goes to the effect’s input; return comes from its output. (See the illustration on the panel to the right for more information.) 9: HEADPHONE: Plug a pair of stereo headphones here for private listening. When this jack is used the i