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Quad Function + Quad VCF​/​VCA - Demo 03 (VCF Mode)

from Sputnik Modular - Quad Function & Trigger Source / Quad VCF​/​VCA by Matttech Modular Demos

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This demo is simply to show what the Sputnik Quad VCF/VCA (a Lowpass Gate) sounds like in VCF mode. No effects or processing was used. This effectively turns the channel into a simple vactrol-controlled lowpass filter, with a lovely "woody" tone to it.

Patch Details:

▪ Essentially the same as Demo 02, except that this time the envelope from the Quad Function & Trigger Source is mixed with the same 1v/oct sequencer output that is controlling the pitch of the Rubicon.
▪ This sequence is mixed with the envelope in the two middle channels of Maths, which is serving as a bipolar mixer.
▪ At various points the envelope and/or sequence are attenuated and inverted against each other. The main cutoff/ bias control on the VCF/VCA is also tweaked to accommodate these varying settings.
▪ I have left a portion of "silence" at the start, in order to demonstrate how well the VCF closes when no CV source is applied. There is typically a bit of high frequency bleed in vactrol filter designs, but I think this amount is very acceptable. This is the same level as in COMBO mode. The VCA is even quieter when closed.
▪ The first thing I do is gradually turn the main cutoff/ bias control through its range, to demonstrate the effect this has on the sound.
▪ Various controls are tweaked during the recording, and PWM is applied to the Rubicon as things progress. The frequency of the Dixie is manipulated, as is the balance and overall level of the waves feeding the VCF. Higher levels add a pleasing fatness to the sound.

credits

from Sputnik Modular - Quad Function & Trigger Source / Quad VCF​/​VCA, released May 9, 2015

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