Moog MESSENGER User Manual page 16

MIXER
The MIXER brings together Messenger's two primary oscillators, sub oscillator, and a noise generator.
Unlike some other Moog mixer designs, this mixer does not saturate – each channel is at clean unity gain
when set fully clockwise.
OSC 1 - Sets the level of OSCILLATOR 1.
OSC 2 - Sets the level of OSCILLATOR 2.
SUB OSC - Sets the level of the SUB OSCILLATOR.
NOISE - Sets the level of the white NOISE generator.
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