MATRIXSYNTH

The Poor Man's Memorymoog - adamstan's DIY Polysynth

via adamstan in this VSE thread. Be sure to check out the thread for follow up posts. The following is the first post in entirety. The reason why I captured it in entirety is so that we do not lose this. When I first started MATRIXSYNTH I linked to VSE threads only to find out they expired and dissapeared over time. That info is lost forever. That said, enjoy this one. It is pretty amazing. Be sure to listen to some of the sound samples below. I found this gem on Sequence 15.

"After almost 2 years of work, I've finished my DIY polysynth :D :D It is based on various module designs available on the net. I consider it to be a "Poor mans Memorymoog" with a little bit of Prophet 5 thrown in ;-). It features:
- 5 voices
- 2xVCO per voice
- 3xEG per voice (hardwired to pitch, cutoff and volume)
- 3xLFO (pitch, cutoff and PWM)
- Moog ladder VCF
- Noise source
- Ring Modulator
- Patch memory (128 user patches)
- MIDI
- Mono mode with selectable note priority (High/Low) and triggering (single/multi) and with portamento
- unison with adjustable detuning
VCO A offers sawtooth, square and triangle. VCO B offers sawtooth and square waves. Having triangle wave available is essential if you want to obtain some nice fm-like sounds from RingMod.

It's built using only standard off-the-shelf components - no CEM or SSM or similar chips inside - only typical opamps, switches, transistors etc.

Case (together with keyboard) was salvaged from some crappy 70's combo organ.

Here it is sitting on a stand (photo made with phone - sorry ):

With front panel lifted up:

With keyboard lifted up (showing voicecards):

Main digital board (keyboard scan, voice assignement and patch memory):

Voicecards close-up:

Front panel close-up [I love the rever keys for bass]:

MP3 demos

It is noisy and tuning drifts a little bit, but hey, isn't that what we love vintage synths for?"

Oakley Voltage Controlled 'Cascaded OTA' Filter

"This is a four pole multimode filter capable of -24dB/octave low pass, -12dB/octave low pass and +/-6dB/octave bandpass outputs simultaneously. The filter core is based on four identical cascaded current controlled integrators. This is similar to the topology found on the filters in the SH series of monosynths as well as the CEM3320, IR3109 and SSM2040 filters of the classic polyphonics.
At high resonance, we call it 'feedback', the COTA VCF will oscillate well over the whole of the audio band with a clean sinewave. Its temperature compensated too. The module also features a feedback input. This is similar to the one we introduced in the groundbreaking Multiladder module. In conjunction with the 24dB/octave output this input allows the resonance signal path to be split. This means that additional modules can process the resonance loop independentally. This allows a large variety of new timbres to be created. And it also allows for voltage controlled resonance with the use of an extra single VCA module.
The design is intended to fit into a 1U wide 'filter-core' module or a more fully featured 2U wide panel with seven control pots."

More info including images and samples at Oakley Modular Synthesizer

"Purple Grits" - Rupert Chappelle, Theremin

YouTube via saintrupert. Great T-Shirt. Watch it while he plays.
"Rupert Chappelle, theremin and synthesizer, September 28, 2008"

MOOG TAURUS 1 analog bass-pedals

YouTube via retrosound72

"vintage synth demo by RetroSound
(for the vintage synth review)

The fattest bass ever...
Moog Taurus 1 bass pedals (demo of the legendary preset sounds and the various VCF and envelope settings, Glide, some untypical Taurus sounds and more);
drums: Roland TR-606

You must have very good bass loudspeakers or a subwoofer to hear the deep frequences.

Attention!
Please turn the Volume pot of your speaker in middle position.
Some sounds can destroy your speakers ... and your ears! ;-)

This video demo is not a musical statement, only demonstration of the sound possibilities of the instrument."

Doepfer 3 x A180 multiples for portable suitecase

Hielo Patagonia Sounds has a post up on a small DIY project to modify the Doepfer portable suitecase with multiples along the top.

The top strip outlined in blue is where the multiples will go.

"The trick will be to use 3 Doepfer A-180 modules and unscrew them from theirs faceplates. Then, use a square aluminium tube (20 x 20 mm - thickness 1 mm), drill some holes in it and screw again the Doepfer modules inside the tube. At the end, just drill two holes in the top wood part of a portable suitcase and screw the new 'Doepfer 3 x A180 multiples in a tube'."
You can find more info including a PDF of the technical drawings on Hielo Patagonia Sounds.

The Lonesomes Cow-Fi

The Lonesomes

Note the moo synth.

via Goesta in the comments of this post on a video by the same artist.

Be sure to see this prior post for a video of The Lonesomes Cow-Fi.

Bassline Concept

Bassline Concept

A pretty impressive synth gallery

via adrien

Roland GR-700 Service Manual

PDF on fdiskc

The user manual is available at the Roland U.S. Product Manual database

Roland manual
Roland manuals
Roland user manuals

The DSP Dimension

DSP Dimension
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