7Guided Tour - VX 3500 Rear Panel5. Effect Send jack - Use this 1/4” unbalanced jack to send low impedance(600 ohm) signal from the Model 3500 to a professional outboard effects proces-sor such as a reverb, echo, chorus, flanger, or harmonizer device.* Output levelis approximately 0 dB to +4 dB and is post-EQ and post-compression butunaffected by the setting of the Master Volume control. You can also use theEffect Send jack to route signal to an external mixing console or amplifier withan input sensitivity of +4 dB.6. Effect Return jack - Use this 1/4” unbalanced jack to return low impedance(600 ohm) signal to the Model 3500 from a professional outboard effectsprocessor.*7. Balance control - Use this to adjust the relative amount of Effect Send (dry)versus Effect Return (wet) signal being routed to the Model 3500 speakeroutputs. At the center-detented “0” position, equal amounts of Send and Returnsignal are routed. At its fully counterclockwise (“Send”) position, no signal froma connected effects processor(s) is added to the main output. At its fully clock-wise (“Return”) position, the only signal you hear is that coming from a connect-ed outboard effects processor(s). If your outboard effects processor has anadjustable wet/dry control, we recommend that you set the Balance knob to itsfully clockwise (“Return”) position and use the effects processor’s wet/dry controlto adjust the relative mix. Alternatively, you can set the effects processor tooutput fully “wet” signal and use the Model 3500 Balance knob to adjust therelative mix of dry vs. wet signal8. Direct Out Post/Pre switch - When pressed in (the “Pre” position), signalis routed to the Direct Out jack prior to the Model 3500 ten-band graphic equal-izer (but after the compression circuitry and Contour controls). When out (the“Post” position), signal is routed to the Direct Out jack after all compression andEQ circuitry (both ten-band graphic and Contour).** Use the “Pre” positionwhen you want the console engineer to have control over equalizing your basssignal; use the “Post” position when you want to use the front panel ten-bandgraphic equalizer to equalize your bass signal before sending it to the console.9. Direct Out Normal/Ground Lift switch - When pressed in (the “Gnd. Lift”position), pin 1 is removed from the chassis. This should be used only when aground loop hum or buzz is heard; otherwise, leave it in the out (“Normal”)position.10. Direct Out jack - Use this electronically balanced XLR jack to route signalfrom the Model 3500 to a professional mixing console or as a tap to a main PAsystem via a mic input on the console. The signal output from this jack is lowimpedance (600 ohm) with an output level of approximately -30 to -20 dB. Youcan also use the Direct Out jack to route signal to an external amplifier with a-10 dB input sensitivity.* In-line effects (such as footpedals) intended for low signal levels should beplaced between the bass and the amplifier Input and not connected with theEffect Send and Return jacks.** Note that the settings of the ten-band graphic equalizer will affect a “Post”Direct Out signal regardless of the position of the front panel In/Out switch.