Pittsburgh Modular Patch Box Manual And Patch Manual page 13

Adding a Modulation Module
This patch adds some modulation to the Filter module with an envelope follower. A simpler
version of this patch would use an LFO (low frequency oscillator) patched in the Frequency
CV input instead of the envelope follower.
An envelope follower, we are using the Pittsburgh Modular Detect module in this example,
outputs a control voltage that is based on the signal level of the incoming audio signal.
This creates an auto-wah type effect in our example patch.
This patch uses the basic "Patching a Module" patch but adds a patch cable connecting
the output of the envelope follower to the Frequency CV input of the Filter module. The
Frequency CV input attenuverter knob of the Filter module is used to set the range and
polarity of the expression signal.
This patch does not utilize the expression pedal inputs or footswitches.
13