Pittsburgh Modular Microvolt 3900, Manual

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18. Inverting Mixer / Splitter / Offset
The inverting mixer / splitter / offset section is a standalone audio and CV processing module included to
enhance the functionality of the Microvolt 3900 patchbay. Because of the flexible design, the functionality of the
section can vary based on the needs of the patch.
Section Functions
2 Channel Mixer
Patch an audio or CV signal into input a(135) and input b(136) to mix the signals. A copy of the mixed output is
available at both output jacks(137 and 138). The level of input a is set using the input a atteunverter trimmer(45).
Set to 12 o
’ clock, the attenuverter is in the off position. Turning the trimmer to the right will raise the level of the
input a signal up to the level of the incoming signal or unity gain. Turning the trimmer to the left will raise the level
of an inverted version of the signal up to the level of the incoming signal or unity gain.
Signal Splitter
Patch a signal into input a the turn the input a level trimmer(45) full right. A copy of the input signal is available at
both output jacks(137 and 138).
Signal Inverter
Patch a signal into input a the turn the input a level trimmer(45) full left. An inverted copy of the input signal is
available at both output jacks(137 and 138).
DC CV Source
The input a level trimmer(45) is internally patched to a 5v source. The input a level trimmer can be used to
attenuate and invert this 5v DC signal. A copy of this voltage is available at both output jacks(137 and 138).
Signal Offset
The input a level trimmer(45) is internally patched to a 5v source. The input a level trimmer can be used to
attenuate and invert this 5v DC signal. Patch an audio or CV signal into input b(136) and the DV voltage from
channel a will be added to the signal sent to input b. A copy of mix is available at both output jacks(137 and 138).