Great River Electronics MIXMASTER 20 - Manual (Page 4)

BASIC OPERATIONS:
The MixMaster 20 has a fairly long turn-on sequence, about 30 seconds. The logic
circuitry powers up first and stabilizes, then the middle voltages that power the
summing input channels (5-20) and the monitor section stabilize, then the long
slow ramp of power for input channels 1 to 4 and the mix and fader amplifiers
stabilizes. This power also lights the meters, so when they come on the unit is
ready to go.
The control room function switches are on the right edge of the unit and include
from top to bottom the Speaker B and A selectors, the Tape button, Patch button
and Talkback.
Speaker A and B control the feed of audio to either or both outputs.
Tape allows instant comparison between listening to the mix when not
pressed, or the stereo return from your mixdown recorder when pressed.
Patch allows instant comparison between listening to the mix without any
effects in the patch loop, or to the full chain when pressed. It is a hardwire
bypass of the patch loop.
Talkback is as expected. The talkback microphone signal is injected into the
Cue output, the mix signal to the speakers is dimmed, as well as the mix
signal to the cue outs.
Control Level affects only the signal to Speaker A and B.
The sideways mounted fader is a high quality Penny & Giles stereo conductive
plastic audio taper unit. It controls the gain of the fader amplifier, which is the
return part of the stereo mix patch send and return. The output of the fader
amplifier is the main stereo mix that is fed to your 2-mix recorder. The fader
amplifier operates at unity gain when the fader is set to 0. The fader amplifier is
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