MATRIXSYNTH

Monday, June 09, 2014

Razmasynth Unknow Pleasures Prototype

Unknow Pleasures Prototype as CV Controller

Published on Jun 9, 2014 RazmatazTG·28 videos

Razmasynth Unknow Pleasures -Prototype: Audio Output

Published on Jun 9, 2014 RazmatazTG·28 videos

"Eurorack modular synth kit project. June 2014."

EMS Synthi AKS Panel

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"EMS Synthi AKS panel only !!! used, extra holes for mods."

Jurgen Haible Frequency Shifter FS-1A

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"urgen Haible Frequency Shifter FS-1A.
The unit was built with the original boards.

Extrenal CV inputs : EXP modulation, 1/V oct for RANGE
LIN modulation for Frequency"

Jurgen Haible 20-pole Phaser

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"Jurgen Haible 20-pole Phaser.
The unit was built with the original boards.
Uses 20 all pass filter stages.

Extrenal CV inputs for Sweep Rate and Pitch."

Jurgen Haible Krautrock Phaser

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"Jurgen Haible Krautrock Phaser. (aka Compact Clone)
The unit was built with the original boards and use light bulbs with ldrs for phasing.

Extrenal CV inputs : Rate and Amount"

Vaco Loco Gorf Sequencer

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"Specifications:

Ability to store and load 64 sequences, 8 sequences in 8 banks
8 Steps per sequence
Bank Play Mode, allowing you to chain up to 8 sequences with variable repeats per sequence
Ability to chain two sequences
Each step has Note number, velocity, gate on/off, CC1 and CC2 controls
Variable Tempo (or MIDI sync)
Variable 'root note' for the notes being played
Variable step length
Randomize function for sequence
Legato mode (for those tb303 slide emulations)
Variable sequence length (1 to 8 steps)
Variable last step
Variable First Step
Selectable CC's for CC1 and CC2 channels
Record Sequence notes from external MIDI keyboard
MIDI Clock out (with start/stop)
MIDI Sync In
knob "snap" mode to prevent unwanted value changes
Sysex dump/load of sequence, bank, complete memory
MIDI sysex update of code"

Moog Voyager Performer Aluminum Edition

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"This is a limited run of special Voyagers, only 100 made.

Manufacturer Description:
The Minimoog Voyager Aluminum Edition is an all-analog performance synthesizer that shines on stage or in the studio. It has an incredible sonic range and power that only a Minimoog is capable of delivering. From the creamiest modulated leads to monstrous Moog bass, the Voyager remains the king of analog synths. And just like the original Minimoog, the Minimoog Voyager was designed and brought to life by synthesizer pioneer, Bob Moog.

The Minimoog Voyager Aluminum Edition is housed in an aluminum cabinet. Combine this with a stunning electric blue backlit panel, blue pitch/mod wheels, and blue LEDs and you have a massive monosynth that will not be ignored.

Features include:
• 100% Analog Signal Path
• 44 Key Fatar Keybed
• Blue Backlit Panel
• Blue Backlit Pitch/Mod Wheels
• 3 Ultra-Stable Oscillators
• 2 Legendary Moog Ladder Filters
• 2 Four-Stage Analog Envelope Generators
• 2 Flexible Modulation Busses
• Assignable X/Y/A Touch Control Interface
• Over 800 Onboard Presets
• CV/Gate Expansion Port"

Doepfer A-101-1 vactrol multitype filter

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"this is the first vactrol based module in the a-100 system. a vactrol is a combination of a light depending resistor (ldr) and a led (light emitting diode) both put into a small light-proof case. increasing the led brightness causes a decrease of the ldr resistance (e.g. the light controlled voltage module a-179 is an application of a ldr). this effect can be used in circuits that require variable resistors to obtain the desired function (e.g. vcfs, vcas, vc phasers, vc trigger delays, vc slew limiters, vc envelope generators, vc lfos, vcos and many more). the advantage of vactrols compared with other solutions (e.g. otas, diodes, transistors or fets as variable resistors) is that they behave like a normal ohm resistor and can handle high voltages without causing distortion. this is probably the reason why the sound of vactrol-based circuits usually is described as soft or mellow. disadvantages are the expenditure and consequently the expenses and the not exactly defined coherence between led current and ldr resistance. for each vactrol the ldr resistance decreases when the led current increases but mechanical and electrical tolerances cause that each vactrol will behave a bit different (e.g. because of the differences in alignement and distance between led and ldr, different brightness of the leds at the same current).

module a-101-1 is a special multitype filter based on an idea by nyle a. steiner (published in electronic design, issue 25, december 1974, page 96 ff). the circuit uses the standard non-inverting amplifier filter design. different filter types (low pass / lp, band pass / bp, high pass / hp) are realized by injecting the audio signal into different points of the circuit and using a common output for all filter types. one may feed three different audio signals into the filter simultaneously. each signal is filtered correspondingly (lp resp. bp resp. hp) and the sum of the three filtered signals appears at the output. of course it is possible to feed the same signal to all three inputs. in this case one obtains different combinations of lp/bp/hp according to the settings of the three input attenuators for lp/bp/hp. even a notch filter is possible (not available in the original design). the filter inputs are normalled, i.e. the bp input is connected to the lp jack socket provided that no cable is plugged into the bp socket (same applies for hp/bp inputs).

in contrast to the original circuit vactrols are used instead of diodes as variable resistors for frequency control of the filter. due to the "crooked" response of vactrols the filter has not an exact frequency control standard (like v/oct). the inevitable tolerances between different vactrols will lead to an individual sound of each module and individual resonance behaviour. even the resonance control is realized with vactrols. consequently this parameter is voltage controlled, too. resonance can be increased up to self-oscillation. resonance and consequently self-oscillation may vary with the filter frequency because of vactrol tolerances.

Doepfer A-127 Voltage Controlled resonance filter

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"module a-127 is a triple resonance filter unit. it contains three separate voltage controlled band pass filters. each filter has it's own lfo (triangle waveform) with led display and adjustable frequency and amplitude. instead of the internal lfo an external control voltage may be used to control the filter frequency. in this case the external voltage is fed into the external cv jack (with integrated switch to turn off the lfo signal) and the amplitude control of the lfo affects the level of the external cv signal. each filter is equipped with the following controls: lfo frequency, lfo/external cv amplitude, filter frequency, filter resonance and filter amplitude. in addition to the mix output for all three filters each filter has a separate audio output. the original audio signal can be added to the triple filter mix signal with a separate control. all of the 3 filters share a common audio input with attenuator. the filter audio inputs are very sensitive so that distortion may intentionally be used to create new sounds - if desired.

the frequency control range of the bandpass filters is about 40hz...6khz, the frequency range of the lfo's is about 0.02hz...20hz (= 1 min ... 1/20 sec per cycle).

each of the three filters can used also as a 12db low pass (with resonance control) instead of band pass. for this a jumper has to be changed on the filter board in question. in this case the module can be called no longer "resonance filter" but "triple low pass filter". it is also possible to modify only one or two of the filters to low pass.

this module has a maximum current draw of 100ma. it requires 28 te/hp worth of space to fit in a eurorack frame."

Yamaha AN1x Analog Modelling Synthesizer SN NL04360

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Published on Jun 9, 2014 HappyProducer·9 videos


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