It's Only Noise - Random Percussion with Sample & Hold, No Sequencer...just for fun #eurorack

video upload by AJH Synth Official

"Messing about with noise and random voltages. This patch is just various noise sources through various filters, frequency-modulated by sample & hold, with envelopes controlling amplitude (VCA) or affecting filter frequency. No sequencer was harmed in the making of this video.

The ‪@solidstatelogic‬ BigSix is used to mix all 4 sounds, with the ‪@vermonagear‬ DSR-3 providing stereo spring reverb for the drone and occasional sound.

Video & performance by ‪@DreamsOfWires‬

Patch Breakdown:

Drone: This is just pink noise going into the FIXED FILTER BANK 914, but with an LFO from the DUAL RVG modulating the mix between the left and right bands of the Filter Bank, creating that slow, breathing effect. The AJH SYNTH 914 has built-in, voltage-controllable mixing/cross-fading functionality, which wasn't present in the original Moog 914 on which it is closely based.

Percussion 1: White noise going to the SONIC XV Diode Ladder Filter, using its band pass output. One channel of the DUAL RVG is sending random voltages to the Sonic's Filter Frequency/Cutoff, whilst a DH-ADSR envelope generator controls its audio level in the TRIPLE CROSS (being used as a triple VCA).

Percussion 2: This starts with noise generated by the LUNAR MODULE - this has 2 noise sources with different character and tone control, and built-in distortion. Its output goes to the MATRIX VCF, which has 16 different filter modes, which I cycle through manually during the video. See out User Guide video for more information: • NEW MODULE! MATRIX VCF User Guide - Vintag...

Occasional Sound: Here I'm using the SAMPLE & HOLD module to randomly trigger the MULTI BURST ENVELOPS module. The Colour control on the Sample & Hold determines the range of random voltages generated. It is a combination of Low Pass and High Pass filter over the onboard noise that is used to derive the voltages, so turning it anti-clockwise from the centre acts as a low pass filter, reducing voltages produced to be in the lower range, whereas turning it clockwise of the centre position acts as a high pass filter, meaning voltages in the higher range. Since it is generating lower voltages here, it is only occasionally producing enough of a voltage change to trigger the Multi Burst Envelopes. If I raise the Colour control it will trigger more often.
The Multi Burst Envelopes produces a chosen number of bursts of the selected envelope shape. The built-in LFO controls the speed of the bursts, as does the Clock input, but both can be used together or independently. I'm using it to control the frequency of the ENTROPIC DOOM's low pass filter, to generate an occasional burst of filtered noise."