Yamaha 12 GF24/12 GF16/12 GF12/12 Owners Manual - Page 20

20 Front and rear panel B ST INSERT I/O jacks These are TRS phone input/output jacks for inserting external effect processors between the ST bus and the STEREO fader. The nominal input/output level is 0 dB. The pin wiring is shown in the following diagram. Tip (send) Ring (return) 1/4" TRS phone plug Sleeve (ground) Connect to INSERT I/O jack C C-R OUT (control room monitor out) jacks These are 1/4" phone output jacks (unbalanced) for monitoring the PFL/AFL bus or the input signal from the TAPE IN jacks (4). The nominal output level is +4 dB. The pin wiring is shown in the following diagram. 1/4" phone plug Tip (send) Sleeve (ground) D GROUP OUT jacks 1-4 These are 1/4" phone jacks (unbalanced) which individually output the signals of GROUP buses 1-4. The nominal output level is +4 dB. 1/4" phone plug Tip (send) Sleeve (ground) E POWER switch This switch turns the power of the mixer on or off. -Owner's Manual 1/4" phone plug Tip (send) To processor's input Sleeve (ground) 1/4" phone plug Tip (return) From processor's output Sleeve (ground)