Pittsburgh Modular Microvolt 3900, Manual

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19. Microvolt Patch Example 5
Ratcheting Filter Frequency (Modulating a Cycling Function Generator)
Another patch highlighting the function generator. This patch uses the ramp output of the LFO to modulate the
rate of a cycling function generator while using the arpeggiator. Depending on how the rise and fall modulation
attenuators (41 & 42) are set, the results can be similar to ratcheting or a bouncing ball type effect.
Understanding this patch will further expand the functionality of the function generator as a modulation source.
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.
Patch the LFO ramp output (129) into the function generator modulation input (132). The rate of the LFO now
controls the rate of the function generator which controls the frequency of the filter cutoff. This can be a nice
mellow patch to tweak. Replace the LFO with the random CV output (126) and adjust the function generator rise
and fall modulation attenuators (41 & 42) for more of a beat synced effect.