Demon Seed - Noise Apocalypse

video upload by circuitbenders.co.uk

"Every year we make a pedal to donate to the raffle prize fund for the local Christmas Covers Southsea gig, where various idiots play ridiculous cover versions to raise money for Rowans Hospice and Music Fusion. This year its the Demon Seed!

The circuitbenders.co.uk Demon Seed is a fuzz / distortion / frequency shifting / 8-bit / lo-fi / filth pedal that makes noise in industrial quantities more than sufficient to made deaf people weep.
It utilises the Holtek HT8950 voice changer chip that was designed specifically for use in toy robot voice changer megaphones. The HT8950 converts the analogue guitar signal to 8-bit digital, applies 6 selectable types of frequency shifting or a weird robot arpeggio effect, and then converts the digital signal back to analogue again.
Before someone points it out, yes this pedal was to some degree inspired by the excellent Death By Audio 'Robot' pedal, but with the addition of several features that the HT8950 chip offers but the Robot pedal doesn't use. The Robot is the original HT8950 pedal. All hail Death By Audio!

This demo was recorded using just the Demon Seed pedal and and a clean amp simulator. You'll have to forgive the inability to play the guitar.

We may well have some of these available in the new year."

HT8950 "robot voice" Eurorack Module Build

Published on Oct 20, 2019 Reckless Experimentation Audio LLC

"I take a Holtek HT8950 voice modulation chip and turn it into a Eurorack module. I found the best spot in your signal path for this module is between the VCO and the VCA, acting as an 'overdrive' effect."

Scramble Everything - Pitch Scrambling Effect from Optotronics

Published on Apr 21, 2018 e j

From the makers of Oi, Kant!

"purchase here: https://www.etsy.com/uk/listing/59534...

Scramble Everything is a strange little synthesiser: both sound generator (it generates random sequences) and an effects unit, a pitch shifter.

The scramble suit in ‘Scanner Darkly’ was “an invention of the Bell laboratories, conjured up by accident by an employee named S. A. Powers... Basically, his design consisted of a multifaceted quartz lens hooked up to a million and a half physiognomic fraction-representations of various people: men and women, children, with every variant encoded and then projected outward in all directions equally onto a superthin shroudlike membrane large enough to fit around an average human. In any case, the wearer of a scramble suit was Everyman and in every combination (up to combinations of a million and a half sub-bits) during the course of each hour. Hence, any description of him - or her - was meaningless.”

Scramble Everything is the scramble suit of synthesisers. Whatever source you use on the input, the output will be completely scrambled, human and non-human speech-like sounds.
The main star of Scramble Everything is the pitch filter effect unit based on robotic voice modulator IC – HT8950 – which can be used either together with the internal random sequencer, or as a standalone effects unit. You can then, following Philip K. Dick, use any input source and scramble the shit out of it. Does the output still contain remains of the original sound? If you want to jump between two realities you can use the special slider that will easily transport you to the other side. Spooky! Can it get more sci-fi? Yes. The filter’s frequency not only can be controlled with the knob, but also with the light. Scramble Everything contains an RGB light source, and its colour sequence (controlled by the internal random sequencer) changes the tone of the filter. The scramble tone then depends on the intensity of each colour (red, green and blue). Additionally Scramble Everything contains three switches for each colour, so you can decide if you want to have smooth or abrupt transitions between the colours.
You can also control the amount of slide between the steps, switch from staccato to legato and vice-versa, control the pitch of the sequencer and its frequency range.
You can also use the random trigger output to trigger external sound sources.

If you want to know more about scrambled realities, please have a look at the Scramble Reading Pack here:
https://www.dropbox.com/s/0gbiwvc7agw...

Scramble Everything runs on either 9 or 12V power supply, 600mA minimum. You can also use a 9V battery.
It has 5.5mm x 2.1mm power barrel (center negative): https://i.ebayimg.com/images/g/czUAAO...

Scramble Everything was designed by Ewa Justka. Some of the conceptual framework of the machine is a result of a collaboration between Ewa Justka and Roc Jiménez de Cisneros."

Four Voice Booglitchoo

YouTube Uploaded by dtauvdiodr on Jun 22, 2011

"A fairly final breadboard prototype of my new instrument: a 4-voice oscillator (NTE4093) with low pass filter (TL082) and a 'robot voice modulator' and bit destroyer (HT8950) all through a nice notch filter at the end (also a TL082).

Ditched the other f/x ideas and may simply add some kind of sequencer to change up the oscillator rhythms, but after going through tons of permutations this is the sound I like.

Some more thoughts about it are on my blog post about it:

http://sounding.com/blog/2011/06/22/booglitchoo-synth-prototype/"

Four Voice Analog Glitchjam

YouTube Uploaded by dtauvdiodr on May 29, 2011

"Current incarnation of a new synth I'm building: two 741 filters, four NAND gate oscillators (NTE4093) in a modulation chain, and a HT8950 bit destroyer / pitch shifter... considering the addition of a sinewave oscillator and a LM567 noise modulator."

HT8950 DIY circuit

YouTube via DeftAudio | February 08, 2011 |

"This is a demo of device based only on one component HT8950. All schematics are from data sheet with minor changes. This is the easiest way to get chip 8bit sound in HW I've ever seen ))))"