Pittsburgh Modular Microvolt 3900, Manual

Page: 60 / 70

60
19. Microvolt Patch Example 4
Modulating the Binary Filter with Multiple Sources (Using the Inverting Mixer / Splitter / Offset Section)
This small patch highlights an important part of the Microvolt 3900 patchbay. The Inverting Mixer / Splitter / Offset
section offers several useful tools that can be utilized in almost every patch. Understanding this patch will expand
the toolset available in the patch bay. The important user interface controls are highlighted in blue but all of the
controls of the Microvolt 3900 can impact the sound and functionality of the patch. Once the initial patch is set up,
experiment with one setting at a time to understand its effect on the signal path.
In this example the ramp output of the LFO is patched into input a (135) of the mixer. This allows the level of the
LFO to be adjusted using the input a atteunverter (45). The output of the function generator (134) is patched into
input b (136) of the mixer and joined with the LFO signal. The output of the mixer (137) is patched into the
frequency CV input of the filter (120). The amount of LFO sent to the filter cutoff in relation to the function
generator output can be adjusted using the input a attenuverter.
The second output of the mixer (138) is patched into the dynamics CV input of the dynamic VCA (123). This
controls the output level of the dynamic VCA.
The modulation mix out (131) is patched into the modulation input of the function generator. This allows for some
variation in the length of the envelope based on the output of the LFO.