H. MIXER
Audio signals produced by the three oscillators, noise source,
and microphone preamplifier are combined and balanced by the Mixer
section’s switches and volume controls. It is this composite signal,
the output of the mixer, which is then modified by the filter and
loudness contour controls and appears as the audio output signal of
the Mini Moog.
1 ) The OSCILLATOR VOLUME controls (12, 13, and 14) are used to
regulate the relative levels of the audio signals produced by the
three oscillators. Switches (C), (E), and (G) instantly turn the
individual audio signals on and off. Switch (G) does not affect the
control signal produced by Oscillator 3 via the Modulation Mix.
The operation of these controls and switches has been discussed
e a r l i e r .
2 ) The EXTERNAL INPUT VOLUME control (15) is connected to a microphone
preamplifier. The input to this preamplifier is the phone jack on
the rear panel labelled EXT. SIGNAL INPUT. Any sort of high impedance
microphone signal or sound source may be fed into this input. This
includes guitar microphone, voice microphone, wind instrument micro-
phone, tape recorder output, radio, etc. Control (15) is adjusted
so that the OVERLOAD light blinks on and off occasionally when loud
sounds come through the external input. Switch (D) feeds this source
into the mixer.
3 ) The NOISE VOLUME control (16) regulates the level of the signal
produced by the Noise Source. This source generates a random waveform
producing pitchless sound. Two "colors" of noise are available---
white, or high-pitched, and pink or low-pitched. These are selected
9
Fig. 5
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