Dual State Variable VCF

The dual State Variable Filter is on the right. The left one has 1 SVF and 1 -24dB low pass.

White jacks across the top are inputs. Controls below them are input attenuators.

Individual manual FREQ and RES controls for each filter. I did this mirror thing where the FREQ are on the outside and the RES controls are on the inside... this was a terrible idea and I really need to rewire those. It is just plain confusing when trying to find the right control.

Top row of red jacks are FREQ CV inputs. Center jack controls BOTH filters for ganged operation.

Bottom row of red jacks are RED CV inputs.

Blue jacks across the bottom are the outputs. Low, high, and band pass outputs are available simultaneously. A notch output can be synthesized by combining the low and high outputs in a mixer (with correct phase - can't remember if an inversion is required or not).

This modules's TOP=INPUT, BOTTOM=OUTPUT, CV=MIDDLE format has worked out pretty well so far.

Audio Sample

Yay

Vowel sound example from using my dual State Variable VCF in parallel. One filter is set low, and the other is set high. In this example, I am using the same AD envelope generator for both, but the modulation levels have separate levels of attenuation, and are 180 deg. out-of-phase (this is done with the matrix mixer module).

You

Another vowel sound created with the dual filter module. This time two independent EGs were used.