Dave Smith Instruments MOPHO KEYBOARD - Manual (Page 22)

Mixer
The Mixer section balances the levels of the outputs of the Oscillators section
and noise generator, and the Audio In/feedback loop before routing the summed
signals to the low-pass filter.
Mix: 0...127 —Mixes the outputs of oscillators 1 and 2 in varying amounts. A
setting of 0 is equivalent to 100% oscillator 1 and 0% oscillator 2. A setting of
127 is just the opposite. A setting of 64 is a 50/50 mix of both oscillators.
Feedback Level/External Volume Level: 0...127— Left Out is normalled to
Audio In. (The Voice Architecture diagram on page 8 details Mopho’s signal
routing.) If nothing is plugged in to the Audio In jack, increasing the Feedback
Level causes more and more of the left output signal to be fed back into the
audio path pre-filter. As the level increases, so does the effect of the feedback.
When an audio cable is inserted in Audio In, the feedback loop is broken and the
audio is processed by Mopho’s filter and VCA. In conjunction with the gain
control, Audio In will accept a fairly wide range of signal levels from low-level
sources like guitars to hotter, line-level signals. For more information, see Using
Audio In on page 37.
Feedback Gain/External Input Gain: 0...127 —Feedback Gain boosts the level
of the feedback signal and is interactive with and dependent upon Feedback
Volume. If Feedback Volume is set to 0, then Feedback Gain has no effect.
(There is no feedback signal to boost.) However, Feedback Gain combined with
higher levels of Feedback Volume can result in effects ranging from pleasing
distortion to squirrelly harmonic weirdness.
This control is also used to boost the gain of signals processed via Audio In. For
line-level signals, additional gain is typically unnecessary. For low-level signals,
such as those from passive guitars or basses, External Input Gain boosts the
signal to more useful levels.
Noise: 0...127 —Controls the volume of the white noise generator.
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