MATRIXSYNTH: Saturday, January 10, 2015


Saturday, January 10, 2015

CMOS 1-bit FIR Filter


Published on Jan 10, 2015 Jacob Watters

"A silly experiment making a FIR filter with CMOS chips.
More info here: http://www.jacobwatters.com/blog/cmos..."


"The idea for this experiment came while chatting with some other synth builders about digital FIR filters. One person had previously mentioned that a Lunetta delay circuit I had made was similar to a FIR filter. It used shift registers like a bucket brigade to delay pulses from a square wave Lunetta oscillator. The taps were divided by increasing amounts along the delay line. The idea was to emulate the decaying level of feedback (echo) in a bucket brigade delay circuit.

So I figured I would give it a try again, but this time with the intent of emulating a FIR filter.

Not Technically a FIR
Before getting into the details of this project, I have to make some disclaimers.
This is an emulation of a FIR filter, and not a replacement.
This circuit is entirely impractical. There are far easier analog methods to filter sound.
This circuit only works with pulse waves. Other waveforms are converted into pulse before being used.
This circuit is noisy due to the low sample rate."

Eight classic electronic sequences with Arturia MicroBrute


Published on Jan 10, 2015 SynthMania

"The Arturia MicroBrute is a really cool minisynth. It also has a very useful on-board sequencer. These are eight sequences from classic electronic songs, done on the MicroBrute. Of course, they could be improved by adding effects, but I wanted to show the sonic character of the synth by itself."

MicroBrute's on eBay

Zeropage - Noisy Boxes


Published on Jan 10, 2015 Zeropage

"Classic Acid Style Jam at the Zeropage Studio"

Oberheim OBX Olympic Keyboard Synthesizer Pin

Note: Auction links are affiliate links for which the site may be compensated.

via this auction

Kawai 100F Analogue Monophonic Synthesizer SN X-2332

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via this auction

"Here is a nice looking analogue monophonic synthesizer from the Japanese synth makers, Kawai. The 100F's filter architecture is reputedly a very close copy of the ARP Odyssey's. The filter was smooth and bright, and could be driven into self oscillation to produce metallic, glassy, tinkling highs or deep sub-bass lows. Sadly, after a period of intermittent signal output, the VCO cant be heard, nor can the VCF when pushed into the self/osc zone, where it should whistle/oscillate wildly. Possibly a VCA output problem but I don't really know. A faint clicking signal from the LFO can be heard and the rate/speed of clicks are adjustable. The synth is in reasonable cosmetic condition considering its age, mid '70s. All slider caps are present as is the original owners manual and paper sound patch templates. Some wear on rear underside of end cheeks and veneered part of lower back panel. A little veneer has parted company with the front of the right hand end cheek. A little corrosion under the paint work near the power on/off switch light. The 1/4" jack ins and outs can be used for external signal processing, connecting other voltage controlled synths and CV/Gate equipment."

Red Roland SH-101 with Mods

Note: Auction links are affiliate links for which the site may be compensated.

via this auction

"THE MODS INCLUDE:
VCF FM controls – Essentially VCF FM allows you to modulate the filter cutoff at audio frequencies to create all kinds of clanging cross modulation and bizarre alien splatters and sweeps. This effect works best with the resonance turned up into self oscillation but also produces good effects with lower resonance settings. The VCF FM waveform control allows you to select one of six sources for the FM modulation source. The options are square (PWM still has an effect), sawtooth, sub-1, sub-2, sub-2 pulse and noise. You can also use the external audio input as a source.
The VCF FM amount knob controls how much the filter cutoff is modulated by the source signal and the switch turns the effect on and off. The VCF FM is probably the most dramatic mod of the lot and while it can be somewhat unpredictable you can create sounds ranging from savagely aggressive grinding to unearthly ring modulation drones that wouldn’t sound out of place on the Forbidden Planet soundtrack.
PWM waveform source – Normally with the PWM set to LFO modulation you only have the option of using the triangle waveform as a modulation source. This rotary switch allows you to set the PWM modulation source to other waveforms independently of the main LFO setting. The options are Triangle, Square, Random, Noise, Sub-1 and Sub-2. The Sub waveforms are actually sourced from the VCO. Changing the setting of the sub octave switch will alter the sound with these sources.

VCF CV input – This jack socket on the top left of the case will accept an external voltage to control the filter cutoff. The suggested input is 0-5V but it can probably take a couple more volts if your Midi-CV converter can deliver them.
Audio Input – This is the jack to the right of the VCF CV input. It will accept an external audio input from any source and can be routed through the filter or used as another VCF FM source.

Audio input FM / VCF switch – This switch sets the destination of the audio input. With it set to VCF the audio input is treated as another oscillator and is run through the VCF and VCA in the same way. You will only hear the external audio if you press a key on the keyboard. Set to FM the audio input modulates the filter cutoff in the same way as the VCF FM sources except the external input can run at the same time as another FM source.
Audio Input Level – This knob controls the level of the audio input.

Filter Overdrive – This knob drives the VCO or external audio source into the filter stage causing the VCF to overdrive and distort. (The words Aggressive & Phat come to mind)

LFO rate extension switch – This is the three way switch located under the LFO rate slider. The right hand setting delivers the normal range of LFO speeds. The centre setting allows much slower speeds ranging right down to 25 second sweeps at the lowest setting. The left hand switch position allows outrageously fast LFO speed, well up into audio frequencies peaking at around 550Hz. Some evil effects can be gained by cranking up the filter mod or VCO mod sliders and switching the LFO to its highest speed.

LFO trigger input – This allows you to inject a normal +5v trigger signal to this socket which will restart to LFO waveform from its zero crossing point in a positive direction. The LFO will still run at the speed set by the slider but every time a trigger is received the waveform will restart. This runs independently of the clock and CV / Gate inputs allowing you to run a sequence via CV / Gate or the sequencer clocked externally and sync the start of the LFO sweep to a certain point instead of letting it run randomly. You can also restart the LFO anywhere you want in a sequence for special effects. One bonus feature of this mod is that it will also accept an external audio signal and retrigger the LFO at audio frequencies. Crank up the resonance, turn up the VCF mod slider, play a drum loop into the LFO trigger input and you can create sounds that will quite literally scare the shit out of you.

In addition to the mods offered on the circuitbenders website & listed above this 101 has an additional Seven x 1/8 jack sockets for extra modular connectivity and madness for....
VCF OUT
SQUARE WAVE OUT
SAW WAVE OUT
NOISE OUT
And 3 X SUB SWITCH OUT ( one socket for each sub octave )"

Sonic Potions Penrose demo: chiptune style broken chords


Sonic Potions Penrose demo: chiptune style broken chords from val pastel on Vimeo.

"just a little demo of the new 'Penrose' eurorack module by Sonic Potions.
Made with my beta test version of the module (that does not have the metal panel)."


"Penrose is a small DIY quantizer module for the eurorack format.

It comes as a complete kit including all parts necessary to build it.

Features

Small and compact
User selectable scales
Generates a gate signal on pitch changes
can be triggered externally

Specs

Current draw: +12V 60mA | -12V 2.5mA
Width: 6HP Depth: 40mm
CV input voltage: 0-10V
CV output voltage: 0-10V"

Dreadbox Murmux Demo


Published on Jan 10, 2015

"This video demonstrates the sound and features of the Dreadbox Murmux Semi-Modular Synthesizer."

http://www.perfectcircuitaudio.com/
Perfect Circuit Audio on eBay

Analodue Invaders. Makenoise, Bubblesound, Doepfer, Intellijel.


Published on Jan 10, 2015 Paul Johnson

"Live improvised 100% analogue eurorack modular noise fest... attack the senses."

Laurentide SynthWorks Launches New Website



Check it out here: http://www.laurentidesynthworks.net

† BEHEADING SYNTHS SINCE 2013 AD †

Specializing, but not limited to Mutable Instruments Shruthi & Ambika and Eurorack DIY.

GH3 Verbos


Published on Jan 10, 2015 Unun Septium

"New camera test. Lumix GH3 shooting Verbos Composition System. Testing out lowest video settings (MP4 1280 x 720) with external Rode VideoMic."

Three Analogue Tools


Published on Jan 10, 2015 Bruno Ender Lee

"live synth jam, January 10. 2015

- Synthesizers.com Studio-88
- MiniMoog Voyager OS
- Simmons SDS-8 drum-expander

composed, arranged & performed by Bruno Ender Lee"

Vermona Perfourmer as drum machine


Published on Jan 10, 2015 SGE

"The Vermona Perfourmer makes a good analog drum machine. I put together a drum patch with kick, snare and hi-hat. Using the insert effects I added reverb and extra filtering. The bassline is a eurorack Harvestman Piston Honda sequenced by a Future Retro Orb. Filter on the bassline is a WMD uHC and envelope."

Synton Fenix II Modular Synthesizer

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via this auction

Tecbug TBS-16 MK II analog step sequencer

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via this auction

"This unit can be run as 16 / 8 / 4 step sequences, it also has a Prog button with some preset sequences, it runs on batteries 9v PP3 type ( not supplied ) comes with manuals and business card. It was purchased new and in VGC from Tecbug, a small bespoke UK company.

I have used it to clock a Roland System 100 sequencer with the trig-out with no problem, it should be ok with most other units with trig-in input, eurorack etc. The level button increases / decreases the overall CV output."

Roland Juno 106 Analog Synthesizer with Original Box

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via this auction

ROLAND SH-101

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via this auction

Korg MS 20 with Original Case SN 143741

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via this auction

ROLAND MC-202 with Flight Case

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via this auction

Korg Minikorg 700s Vintage Synthesizer

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via this auction

Korg EX-800 SN 002238 with Original Box & Extras

Note: Auction links are affiliate links for which the site may be compensated.

via this auction

"Included with this sale:
- Korg EX-800 synth
- Original rack ears
- Original power supply
- Original instruction manual
- Original MIDI educational book that came with the synth
- Original box with original styro inside"

KURZWEIL K2000 expanded K2VX sounds


Published on Apr 20, 2014 oscillator

"K2VX is a K2000 which included an expanded ROM sample set (incorporating the Orchestral and Contemporary ROM sound sets).

In this demo track you can hear some percussions, basses and guitar-like patches, then many sound effects and much more synth sounds to give you a conception about Kurzweil's V.A.S.T engine possibilities of this legendary machine."

E-MU MORPHEUS Z-Plane Synthesizer sounds


Published on Jan 10, 2015 oscillator

"Z-Plane Synthesizer rackmount module with ASIC chips to deliver sweepable parametric 14-pole digital filter "cubes" (the Z-plane filter). The Z-Plane filter is composed of up to eight complex filters that model and interpolate resonant sound characteristics.

In this demo track you can hear some single notes, chords and sequences to give you a conception about Z-Plane filter synthesis possibilities of this legendary machine."

Teisco 100p Demo


Published on Jan 10, 2015 marcelo malmierca

KORG volca - The Tower of Druaga


Published on Jan 10, 2015 Masami Hashimoto

"volcaでドルアーガの塔を試みる。
volca bass の台数とメモリが足らないので何回かに分けています。
内訳 : スタート〜メインBGM〜ステージクリア〜ドラゴン〜ドルアーガ〜サッカバス〜ファン­ファーレ〜エンディング〜ゲームオーバー"

Korg Volcas on eBay

Octatrack + Analog 4 tutorial: How to make them work together


Published on Jan 10, 2015 Seen From Space

"How to set one machine to follow pattern changes on the other. Plus physically connecting them up.

This is something that took me quite a long time to get right, thanks to the sheer complexity of Elektron machines, and some gaps in the documentation.

It was down to the nice people at Elektronauts to help sort me out. If you're not already signed up at http://www.elektronauts.com, then please do so. It's a great community, and there are moderators from Elektron who will occasionally chip in with some advice."

Doepfer BABY CASE for Models


Published on Jan 10, 2015 paul tas

"BABY CASE eurorack DEMO www.errorinstruments.com"

Thought that was pretty funny.

Mikrophonie Contact Mic Module full diy kit DEMO www.errorinstruments.com


Published on Jan 10, 2015 paul tas

The Mikrophonie is by Music Thing.

Mutable Instruments Clouds - Chords


Published on Jan 10, 2015 ikkini

Roland HS-60 Powder Coat and Synth Graphics Overlay


Published on Jan 9, 2015 hagbardce1ine

And some more of the inside:

Roland HS-60 (Juno-106) power Supply Recap and MN3009 replacement intro
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