Elby Designs ED120 Chaotica Chaos Generator

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"Make your patches evolve with chaos!

The ED120 is a multi-featured, autonomous, third-order chaos circuit with the following functions:

A third order system with a total of four nonlinear elements in the circuit path to provide a wide range of chaotic signals.

Exponential voltage control of rate (frequency) over a wide range, from creeping sub-audio rates to well up into the kHz audio range. Linear voltage control of loop damping, gain and offset. Many interesting sweep and modulation effects are enabled by these control inputs.

A Reset/Inhibit input which allows the system to be set to zero voltage at all three integration stages. This has many interesting uses. For example, the chaos path's evolution can be followed by varying the rate of a series of reset pulses. By limiting the range of an attractor's evolution, one can produce interesting and complex periodic waveforms.

Voltage outputs for all three system variables, X, Y, and Z.

Features

Rate knob
Rate CV In with level knob
Damp level knob
Damp CV In with level knob
Offset knob
Offset CV In with level knob
Gain level knob
Gain CV In with level knob
NL Drive level knob
Tame/Wild switch
Eyes switch
Reset-Inhibit input"

Elby Designs ED102 Octave Volts Hertz CV Processor

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"The ED102 is ideal if you want to upgrade your synthesizer by adding on other synthesizer units having different kinds of keyboard control voltage and trigger signals.

The built-in, fully adjustable log amp, anti-log amp, and trigger processor ensure complete system flexibility and compatibility between any presently voltage controlled synthesizer. In order to get the most out of your ED102, please read this owner's manual carefully before use. The ED102 Hz/V/Oct Converter is designed for the purpose of connecting V/Octave synthesizers with Hz/V synthesizers. This sophisticated signal processor greatly enhances the performance possibilities of your synthesizer.

Among presently available music synthesizers, there are two different types of control system used for the VCO (voltage controlled oscillator) and EG (envelope generator). One of these systems is used by Korg and Yamaha; the other is employed by every other synthesizer manufacturer. The ED102 provides you with a way to change the control signals of one system into the control signals used in the other system. In this way, it acts as an interface so that any two synthesizers can be used together, provided that the synthesizers are equipped with the conventional input and output jacks for control
voltage and trigger or gate signals.

CV systems

In the Hz/V system, the VCO oscillator frequency is proportional to the control voltage whilst in the V/Octave systems the oscillator frequency changes one octave for every one volt (1V) change in the control voltage. Since an increase of one octave means that the frequency is doubled, each increase of one volt in the control voltage means a doubling of VCO frequency.

The problem with the V/Octave system is that it must employ a log amp in order to double the frequency for each one volt increase in the control voltage. Log amp circuitry can, unfortunately, be very unstable because of its sensitivity to temperature changes. This causes so many problems that most professional musicians automatically assume that synthesizers always have unstable pitch. When Korg developed their first Korg synthesizer, they decided that such a circuit was entirely unsuitable for a musical instrument. So, instead they invented their own unique, patented circuit in which the keyboard voltage (which is the VCO control voltage) itself doubles for each one octave increase in pitch.

Four Sections

Log Amp: This changes a Hz/V type keyboard CV (control voltage) output into a V/Octave type of CV. Use the Log Amp to change the control signal from a Hz/V synt
hesizer into a signal you can use with a V/OCT synthesizer.

Hz/V input (0 ~ 15V)
Oct/V Output (-12V ~ +12V)
Frequency knob: Bi-polar offset of frequency
Width knob: Bi-polar control of width of the output
Antilog Amp: This changes a V/Octave type of keyboard CV output in to a Hz/V type of CV. Use this Antilog Amp when you want to control a Hz/V synthesizer, such as a Korg, by means of a unit that uses the V/OCT system.

Oct/V input (-4V ~ +4V)
Hz/V output (-12V ~ +12V)
Frequency knob: Bi-polar offset of frequency
Width knob: Bi-polar control of width of the output
Adding Amp: This can be used for mixing control voltage signals or sound signals. When not plugged into an outlet, the adding amp operates as if -5V and +5V inputs were connected to its two channels. Therefore, depending on how you set up your equipment, you can also use the adding amp as a voltage supply, or to shift a control voltage to a higher or lower value, and so forth.

Two inputs each with level knob
Mix output
In 1 normalled to a +5V DC signal
In 2 normalled to a -5V DC signal
Trigger\Gate: This lets you change either type of trigger signals, S-Trig or V-Trig, into the kind of trigger signal you need by means of the Reverse switch.

2 Identical sections featuring:
Input (Vth = +2.5V)
Output (0V ~ +15V)
Reverse Switch
LED Indicator"

Elby Designs CGS775 Serge VCS Voltage Controlled Slope Module

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"The CGS775 Serge VCS (Voltage Controlled Slope) is an extremely versatile module capable of many useful functions.

The VCS is a unity gain voltage follower. The rising and falling slopes are independently and jointly voltage controllable over a wide range. The module provides an incedible amount of possible functions.

Slew time can be set separately for rise or fall and be modulated by a control voltage. Separate inputs for rise and fall modulation and also a common input. The modulation controls are bipolar and can be toggled between linear or non-linear behavior. A trigger on trigger input fires an envelope while a gate holds sustain. After a cycle of the envelope a gate signal is generated at the end-out. The cycle switch connects the end-out with the trigger in so the VCS can loop itself and act as an oscillator which frequency can be controlled via the Exp-CV jack. Manual control of waveform with the rise / fall controls. If an audio signal is fed into the module, the pots act as waveshape or cutoff controls.

Some possible functions:

VC Transient Envelope Generator: A pulse at the trigger input will start the envelope, or a gate input will sustain the level and the envelope will fall when the gate goes low. Rise and fall are independently and jointly voltage controllable, with variable linear and exponential wave shapes.

VC Portamento: Voltage is slewed according to the rise and fall times.

VC LFO: When the cycle switch is thrown, the trigger input is connected internally to the end trigger output, creating a VC clock with variable waveform and independent rise and fall times.

VC Oscillator: While not as wide ranged, or accurate as a dedicated oscillator module, the VCS is still an excellent audio source. The Exp CV input is scaled approximately to the 1v/oct standard. The Output wave can be swept from triangle to saw with linear and non-linear waveforms. End Out also produces a pulse waveform.

VC Non-Linear Audio Processor (Low-Pass Gate): If an audio rate signal is slewed, the module responds like a VCF, and a rough VCA. The signal is low-pass filtered down to silence, similar to a low-pass gate.

Envelope Follower: Positive and negative peak detection envelope follower.

VC Pulse Delay: Trigger input starts the envelope and a trigger will be produced again at the End Out when the envelope completes its cycle.

Sub-Harmonic Generator: If a series of triggers are applied to the VCS faster than the total rise and fall times, the module will divide the incoming signal by a whole number. In the audio range the output will be the sub-harmonic series.

Features

Input
AC Out: AC-coupled output, best for audio rate
Output
Output LED inidicator
End Out: Outputs gate at the end of each cycle
Trigger Input
Cycle switch: When engaged the module acts as an oscillator
Rise time knob
Fall time knob
VC Rise, Fall, and Both inputs
VC Rise and Fall level knobs: Bi-polar knobs which maybe be pulled to switch from linear to non-linear
Exp CV input: Approximately 1V/Octave"

Elby Designs CGS757 Bi-N-Tic Filter Module

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"The CGS757 Bi-N-Tic Filter is a strange mixture of a VCO and a switched capacitor filter based on the filter presented by Jan Hall in Electronotes. If you are after something different, this fits the bill. After all, how many filters have a sync input?

A little on how it works:

A VCO drives a pair of analog switches, switching two banks of eight capacitors across op-amps, creating a multi-passband or comb filter at f0, f1, f2, etc. Two controls are provided within the structure of the filter - damping and bandwidth. Not all combinations of these two are actually valid, some resulting in silence, but none the less, quite an array of variations is possible.

The VCO is connected via a signal processor to the input of a binary counter, creating divisions. The first three divisions are used to drive the pair of analog switches. The remaining divider outputs are also available via the Feedback rotary switch. This is passed through a level knob and fed back into the input of the filter itself, thus giving the filter an excitation signal that is perfectly in sync with its operating frequency. This causes the filter to become a very unusual oscillator, giving quite complex waveforms or even simple waveform sequences (ringing bursts). There is also an "Excite" input for using external signals to excite the filter, select X on the Feedback switch to engage it.

Features

Internal VCO:

Logarithimic FM (1V/Octave) Input
Linear FM Input
Sync Input
Coarse Tuning Knob
Fine Tuning Knob
Filter:

Feedback switch: Selects excitation signal to be fedback in to the filter
6 Feedback modes: Choose between 5 different divisions of the VCO frequency or an external signal
Feedback level knob
Damper control knob
Bandwidth control knob
Excite (X) input: Input external excitation signal to be used by the feedback section
Signal Input
Signal Output"

Elby Designs CGS738 Mangler Saw Pitch Shifter Module

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"The CGS738 Mangler is a euro-version of the CGS38 saw pitch shifter from Ken Stone. It is a combination of op-amp summers and comparators with surprising results, ranging from complex wave shaping to pitch shifting of saw tooth waves.

Some ideas on how to use this module:

As a waveform mangler: Feed it any combination of waveforms, or a waveform and a control voltage and adjust as needed. For example, feed a waveform from a VCO or LFO into one input, and adjust the input level for differing effects. Use a control voltage as an offset signal to introduce variation. This can be from an envelope generator, keyboard or LFO or another VCO.

As a sawtooth frequency doubler: Feed in a single sawtooth wave, and adjust the associated gain. When the gain reaches 2, assuming a 0 to 5 volt waveform, the result will be a sawtooth of twice the frequency at the first output.

As a sawtooth pitch shifter: Feed an audio frequency sawtooth wave into one input, and a sawtooth wave from an LFO into the other. Disable one input using the switch, then adjust the input level of the other input until the LED lights, and then back off until it goes out. Disable the other input using the switch, then repeat the procedure for the other input. Return the switch to the center position. The LED will now work as a "signal present" indicator and can be ignored. One output will be the sum of the two frequencies, and the other should be the difference, depending on the relative slopes of the two sawtooth signals. If the result sounds rough, tweak one of the inputs until it sounds clean.

Note that getting the pitch shift to work correctly takes some experimenting and tweaking. The input waveforms should be in the range of 0 to 5 volts - specifically with the bottom of the waveforms actually hitting 0 volts. An external offset may need to be mixed in if this cannot be achieved. The downward shift output is very sensitive to gains and offsets, and is unlikely to be as pure as the upward shift output. If you want a more accurate downward shift, swap the direction of one of the input waves, and upward shift output will act as a downward shift output and vice versa. Some very powerful sound can result, even with impurities in the shifting, especially when the incoming frequency, and the up and down outputs are mixed together.

Also note that this is NOT a frequency shifter, the relationship between the harmonics are preserved.

Features

2 Inputs
Level knob per input
Kill Switch: K1 kills input 1, K2, kills input 2, center position passes both inputs
LED feedback
Up and Down outputs"

Elby Designs CGS747 Cynare Drum Simulator Module

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"The CGS747 Cynare Drum Simulator is a euro version of the third in the series of CGS drum simulators. It generates a single drum sound that can be adjusted to sound like a cymbal, hi-hat, snare drum, electronic drum, or numerous other percussive sounds. It is a complete dedicated synthesizer in its own right, including six oscillators, a noise source, a mixer, an envelope generator, a VCF and a VCA.

Some ideas on how to use this module:

There are two inputs for controlling the envelope of the generated sound. The first is Decay. Attack is preset at the fastest rate possible, the decay controlling the fall off rate of the envelope. This decay is also affected by the Damper control, which operates in parallel with the Decay. A gate input into the Sustain jack disables the damper, thus allowing two different rates of decay to be set depending on the input to the sustain jack. Note: if the damper decay rate is set to minimum, and the sustain input is below about 2V, the envelope will be set at minimum, with the decay control having very little effect, so if you do not wish to use the sustain input, the damper decay rate should be turned to maximum.

If a square wave or similar gate waveform is connected to both the sustain and trigger inputs, the fall-off of the envelope will be affected by the decay control while the gate signal remains high, the damper kicking in as soon as the gate falls low. This allows for easy implementation of open/closed hi-hat sounds etc.

A little on how it works:

Incoming trigger and sustain signals trigger the onboard envelope. If the sustain gate signal is low, the envelope is run through the damper section. Otherwise, if the sustain gate signal is high, the envelope is only controlled by the decay knob. An LED indicates whether or not the damper is active.

The envelope is also passed through a processor that allows it to be scaled and inverted via the bi-polar envelope knob, giving a range of positive and negative envelopes to drive the VCF.

There are two noise generators, a conventional one, and a "shimmer" generator consisting of six independent oscillators with their outputs "ring" modulated via the exclusive OR gates, and mixed.

A knob allows the ratio of noise to shimmer to be adjusted. A filtered version of the trigger pulse is used to generate an impact sound, and this is mixed with the output of the shimmer/noise section.

The filter section is directly taken from the Steiner VCF.

Features

Trigger and Sustain Inputs for envelope
Envelope Decay and Damper level
6 "Shimmer" Oscillators with level knob
"Noise Shimmer" with bi-polar level knob
"Impact" with level knob
VCF section based on the Steiner VCF
Mode switch for selecting Highpass, Bandpass, or Lowpass VCF mode
VCF Cutoff Frequency and Resonance Knobs
CV input with level knob
Routing switch selects if the VCA is before or after the VCF in the signal path
Output"

Elby Designs CGS735 Synthacon Filter Module

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"The CGS735 Synthacon Filter is a "tribute" module, based on the awesome Steiner-Parker Synth VCF.

Unlike most multimode filters, which have a single input and seperate mode (LP/HP/BP) outputs, this filter has an input for each mode and a single output. This gives the filter a ton of character and allows for a lot of interesting effects. Resonance is a bit unusual in its behavior. Once it starts oscillating, the resonance pot needs to be backed off a fair way to get it to stop again. It can also be frequency dependent.

This module includes an input mixer. Each of the filter type inputs has its own level control. The ALL input is also affected by these level pots as it is mixed with the individual inputs prior to the level controls. If using only a single input, it may be better to feed the signal into the ALL input, and adjust the level pots to select LP, BP or HP, rather than changing the patch cord between the specific input jacks.

If the same signal is used in all inputs, the result is reminiscent of a phaser. The real fun starts when you feed different signals into each input, then you get a frequency based "interpolating scanner", where sweeping between different sound sources is possible, though also subject to the frequency at which they are running.

Features

All input - Feeds input to all modes
Highpass, Bandpass, and Lowpass modes
Input and level knob per mode
Resonance level knob
Cutoff Frequency knob
Cutoff Frequency CV in with level knob
Single Output"

Circuit Bent Diabolical Devices Alesis HR-16

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"Modified Alesis HR-16 with 24 point LED circuit bending patch grid and master pitch control.

The Diabolical Modified Alesis HR-16 accesses ROM-based bending effects by use of a 24 point patch grid. A single LED patch pin will make a connection and generate one of many bizarre effects and glitches ranging from distorted, filtered and modulated effects, to bizarre sounds and warped drum loops. The LED on the patch pin reacts to ROM data present at that point and puts on a light show.

This modification also includes a master pitch control with bypass switch and LED indicator, which affects all sounds. The patch grid and pitch control in combination can produce some truly unique drum and synth sounds. These are great machines and the HR-16 is loaded with original features. The modification unleashes the evil monster that has been hiding inside since the 80′s.

Diabolical Devices fully refurbishes their modified devices and uses quality parts. Not only do you get fun new features, you get a machine that's more reliable than ever and can still function as a stock unit would.

Comes carefully packed with 4 LED patch pins, basic instructions to get you started, and a repair warranty. Basically if it should fail in the future, just send it back, the unit will be repaired and returned to you no charge (excludes physical damage, mechanical components, misuse, and other unreasonable situations).

Features

24 point Matrix Patching Grid: Triggers Glitches and Effects when single patch pin is inserted
4 LED Patch Pins: LED responds to ROM activity
Master Pitch/Clock Speed Control with bypass switch and status LED"

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Circuit Bent Diabolical Devices Roland TR-707

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"Fully refurbished Roland TR-707 drum machine, with a twist! Added pitch controls and a circuit bending patchbay allow for tons of expirimentation and unique sounds. Disengage the modifications to use it as a classic stock 707, or engage the pitch controls and start plugging in the circuit bending patch cables to explore it's awesome new sonic capabilites.

Pitch Controls

10 by-passable pitch controls have been added, which affect individual sounds or groups corresponding with the volume faders. Each pitch adjustment has a by-pass toggle switch, pitch control, and status LED. This modification works by manipulating the clock frequency of the affected sounds playback. In bypass mode the original clock frequency is received and the original 707 sound is produced. When the pitch adjustment is activated the original clock frequency is replaced by the added external and adjustable clock frequency generators. Pitch ranges from way above to WAY WAY below original clock/pitch.

Circuit Bending Patchbay

In addition to pitch controls, the modification includes a 10 point ROM-based bending interface aka circuit-bending patchbay. Linking these points with patch cables accesses a mixed bag of odd effects, filter, modulated, and otherwise unique sounds. These effects are the result of cross-modulated and otherwise scrambled ROM data being converted to audio. When none of the modifications are engaged these machines will function and sound as Roland intended. Modification only affect audio and all other functions remain functional no matter what mode or modifications are engaged.

Fully Refurbished

In addition to the insanely fun modifications, all units are fully refurbished. All Diabolical Devices TR-707's are completely disassembled and cleaned: the panel/button board, all key contacts, switching outputs, and all faders and cleaned and treated. The DC power input is replaced and the circuit board is treated to prevent future failure (common weak spot). All interface jacks (MIDI, audio in/puts, and sync) are resoldered and inspected. This makes for very reliable instruments, complete with repair warranty.

Comes carefully packed with basic instructions to get you started, and a repair warranty. Basically if it should fail in the future, just send it back, the unit will be repaired and returned to you no charge (excludes physical damage, mechanical components, misuse, and other unreasonable situations).

Features

10 External CMOS CLK Generators/Pitch controls with bypass switch and LED indicators
10 point circuit-bending patch bay (3 patch cables included)
Blue LED color change
Fully refurbished unit
Repair warranty"

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Bleep Labs Bleep Drum Lo-Fi Drum Machine

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"The Bleep Drum is an Arduino based lo-fi drum machine designed by Dr. Bleep. It includes a sequencer and pitch adjustable samples.

Features

Four sounds, two with pitch control
Four selectable sequences
Record patterns just by playing them
Tap tempo
Reverse mode
Hyper Noise 30XX mode
Stereo 1/8″ output
Operation

The left knob controls the pitch of the red pad, the snare.
Right knob controls the blue, tom pad.
Play – Stop and start playback of selected sequence. Light will blink white on the beat.
Record – Start and stop additive recording. Any pad played will be added to the sequence.
Light blinks red.
Tap – Tap tempo
Shift + pad = Change to that color sequence. Light will change to that color.
Shift + Tap + right knob = Change tempo with knob.
Shift + Play = Reverses samples
Play + Record = Erase current sequence.
Blue and yellow sequences start with kick on the 1 and 3.
NOISE MODE 30XX: Hold shift while turning on the device. The light will turn green. Hitting shift again will turn it pink and blinky
In 30XX mode: Green Pots control the pitch just like normal, Pink Pots control noise, All other controls are the same."