"The unit has some very minor cosmetic wear and scratches but overall in very clean condition. All functions are working. This unit has been serviced , cleaned and tested before listing. Please see pictures for cosmetic condition. This unit comes with adapter PGA-100 (100v-240V)"
"The MOTM 700 Dual Voltage Controlled Router is a unique module.
A pair of separate weighted switches that can route audio or voltage, and can be run parallel or in series.
It is controlled by setting a potentiometer at a value from -5 to +5 volts on the front panel, thus setting a threshold for incoming CV to throw the switch one way or the other. It can be used as 1 in 2 out, or 2 in 1 out, per switch.
It's like having an extra set of hands protruding from your body patching furiously fast on your behalf, but without the hideous immoral experiments to get you there.
Some examples of uses:
Split points. Play your keyboard, as you go up or down the notes several events can be programmed to happen, be it timbral, textural, or pure insanity. Or unpure, your preference.
Published on Aug 21, 2019 Pittsburgh Modular Synthesizers
"The fifth episode in a series documenting the features and functionality of the Pittsburgh Modular Microvolt 3900. This episode is an overview of the dynamic VCA section."
"The idea for this module came from a schematic that has been floating around the web for years - 'beat frequency indicator'
The idea is to feed the circuit two signals and depending upon which one had the higher frequency the ring of 4 LEDs would light up in a clockwise or anti-clockwide direction. The speed of rotation would indicate how close or disparate the frequencies are. If the signals have the same frequency then just one LED is lit.
The original circuit used 74xxx series ICs for the logic, so it was simple enough to find the CMOS equivalents (sort of), then add gates corresponding to the LEDs and use the spare outputs of one chip to feed pots to make sequences. Then for good measure a discrete XNOR circuit was added to give a psuedo ring-modulator output based on the 2 incoming signals.
In operation this module is quite unique; the CV signals return to 0 between each step, the length of each step can vary depending on the incoming signals. Gates come in spurts. The circular LED display jerks around, sometimes it completes several revolutions confidently and then stutters between two stages, sometimes it shimmers on one spot.
At both audio rates and clock rates, this module is quite unpredictable but always seems to be putting out useful signals.
"In the simplest sense, this is a switching module. It is a little different though because it has 3 states rather than just on/off:
\operatorname{sgn}(x):={\begin{cases}-1&{\text{if }}x<0,\\0&{\text{if }}x=0,\\1&{\text{if }}x>0.\end{cases}}
In this case, the module uses approx 1V, rather than 0V, as the switching point, so that it can be controlled by gates. It is simple to bring it back to 0V for those who think it should be.
Also the '0' state is really a result of the diode voltage drops rather than any circuit design trickery.
The signal on the bottom input is fed to the switch of the Switch jack (oh yes) so the incoming signal can switch itself without any help.
The three states actually mean there is a flat spot at the switching point, so the circuit can be used for audio but at slow rates there is a click, so it is far better suited for CV processing.
This circuit originally was used as the nonlinear element in the Primal Hyperchaos and two of them in the Hyperchaos Deluxe. I quite like it on its own, so the Signum Hyperchaos brought the signum section to the panel where it could be used as a stand-alone module. This version drops the chaos and just has the Signum.
The switching is done by diodes rather than a dedicated IC.
The panels are available in white/gold and black/gold in both Pulp Logic and Intellijel formats. Please specify which colour and which format you want when ordering.
Also the PCBs are the same for both panel formats and use a standard Eurorack power connector. There is no provision for the Pulp Logic 3 pin power connector.
"This is a custom built modular synthesizer comprised of the MFOS Soundlab Ultimate and two identical Soundlab Expanders. The case itself was made from old bleachers from the school the builder worked at (who is one of the recommended builders on the MFOS website if you didn't feel up to the DIY challenge). The main synth voice is normalized but can be repatched. The patch points are an interesting combination of banana jacks and 1/4" jacks. There is a passive multiple box included that convert 1/4" and banana cables in either direction.
The bottom of the unit was also signed and dated by Ray Wilson when it was sent in to have the envelope generators response curve tweaked (I believe to make them snappier)
Soundlab Ultimate Features
3 VCOs with Square and Saw Waveforms
Noise Source
External Input
5 Channel Mixer
Analog Lowpass Filter
Analog VCA
Attack and Decay Envelope Generator
Sample & Hold Circuit
Gate Repeater
2 LFOs with Square, Rising Saw, Triangle, Falling Saw Waveforms, and Low and High Rate Ranges
4 Attenuators
Soundlab Expander Features (per each side)
Attack Decay Sustain Release Envelope Generator
Analog Multimode Filter w/ Lowpass, Highpass, and Bandpass
Analog VCA
Ring Modulator (Analog Multiplier)
Signal Booster
Envelope Follower
CV Inverter
4 Channel Mixer
Also included are a bunch of banana cables (some stackable, some not) 3pin cables to link the power from the main Soundlab to the 2 Expanders, and a separately built project Voice of Saturn drone synth. The Voice of Saturn does work but is a little finicky, and seems to need some calibration as the ranges on the controls are very narrow. But it will be an interesting add-on to this system giving you 2 extra VCOs and 1 LFO."
"The SY-35 is an awesome sounding vector synth capable of some extremely interesting and evolving sounds. Although very rich and unique sounding, editing is focused around envelope times and preset sound generation, making this more of a musically focused synth that almost always sounds good!"
"In the simplest sense, this is a switching module. It is a little different though because it has 3 states rather than just on/off:
"This is a custom built modular synthesizer comprised of the MFOS Soundlab Ultimate and two identical Soundlab Expanders. The case itself was made from old bleachers from the school the builder worked at (who is one of the recommended builders on the MFOS website if you didn't feel up to the DIY challenge). The main synth voice is normalized but can be repatched. The patch points are an interesting combination of banana jacks and 1/4" jacks. There is a passive multiple box included that convert 1/4" and banana cables in either direction. 
