G-Storm Electro DIY VCF Module

Classic Synthesizer Filter Breadboard

Published on Nov 9, 2017 gstormelectro

Watch the above video if you want to guess what the filter is modelled after. The answer is in the video below, so don't look if you want to guess.

"Audio + Video by G-Storm Electro c.2017

My first video in HD 1080p! Today I am demonstrating a classic lowpass filter circuit study on a breadboard. Shrill audio alert! - Self-oscillation audio tests are performed here. All I can say at this time this circuit is not exactly Moog per se, and the self-oscillation droid sounds are another BIG clue. I run a pulse from my Pittsburgh Synth Box, sweep the frequency cutoff, then use CV modulations with an LFO and then sample/hold. I am planning a glorious eurorack module of this circuit so stay tuned."


Tonus VCF Module First Look [ARP 2600 4012 Filter Eurorack Adaptation] Published on Nov 21, 2017 gstormelectro

"Audio and Video by G-Storm Electro c.2017

In my previous video I showed a breadboard circuit of a classic analog synthesizer filter. The identity of the filter was left a mystery. Today in this video I not only reveal that it is a faithful Eurorack adaptation of the 4012 module from the early ARP 2600 synthesizers, you will get a sneak peek at my hand-crafted prototype design - the Tonus VCF - and hear it in action!

I jump right in and see how the Tonus VCF sounds by sending the resonance into self-oscillation. Be warned, demonstration of resonance self-oscillation can be shrill. Then I cut the resonance and send a sawtooth to the audio input, then a square wave, then a complex digital waveform from the Pittsburgh DNA Symbiotic Waves. After that I remove the audio inputs, return to pure resonance self-oscillation, and this time send the Sawtooth into the CV input to make the filter go berserk with some Filter FM. These are the kinds of sounds the ARP 2600 was known. Last I use an LFO and Sample-Hold as CV inputs. Audio recorded direct to Tascam DR-05, no effects."