Yamaha 4FX Owner's Manual - Page 12
External Effects, Monitor Mixes, and Groups, AUX Buses For Monitor Sends, and Overall Effects - mg12 12 channel mixer
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Making the Most Of Your Mixer 4. External Effects, Monitor Mixes, and Groups 4-1. AUX Buses For Monitor Sends and Overall Effects There are a number of reasons why you might want to "tap" the signal flowing through your mixer at some point before the main outputs: the two most common being 1) to create a monitor mix that is separate from the main mix, and 2) to process the signal via an external effect unit and then bring it back into the mix. Both of these functions, and more, can be handled by the mixer's AUX (Auxiliary) buses and level controls. If the mixer has two AUX buses, then it can handle both functions at the same time. Larger mixing consoles can have 6, 8, or even more auxiliary buses to handle a variety of monitoring and processing needs. Using the AUX buses and level controls is pretty straightforward. The only thing you need to consider is whether you need a "pre-fader" or "post-fader" send. AUX sends often feature a switch that allows you to configure them for pre- or post-fader operation. Pre/Post-What's the difference? pre post A "pre-fader" signal is taken from a point before the channel fader, so the send level is affected only by the AUX send level control and not by the channel fader. Pre-fader sends are most commonly used to provide monitor mixes. A "post-fader" signal is taken from a point after the channel fader, so its level will be affected by both the AUX send level control and the channel fader. Post-fader sends are most commonly used in conjunction with the mixer's AUX or effect returns for external effect processing. Pre-fader send for a monitor mix. The send signal is fed to the monitor power amplifier and speaker system. The channel fader does not affect the send level so the monitor mix remains independent of the main mix. No return signal is used in this case. AUX Send Level Channel Fader Master Fader AUX Send Level AUX Return Level Post-fader send for external effects processing. The send signal is fed to the external effect unit-a reverb unit, for example-and the output from the effect unit is returned to the AUX Return jack and mixed back into the main program. The send level is affected by the channel fader so the effect level always remains in proportion to the channel signal. 12 MG12/4FX