Sequential Circuits Pro-One

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ARP OMNI

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SYNARE 3 Drum Synth PS-3

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"The Synare 3 may be the most popular type of drum synth from the 70s and early 80s, well known for the noise clap sound from Betty Davis Eyes, that disco space tom thing, and countless other songs from the period. This unit is a drum pad and flexible analog synth in 1. Makes simple drum sounds as well as complex FM sounds. Has 2 oscillators - 1 can be switched to noise, 2 can be switch to LFO."

MOTM SN76477 SUPER CONTROLLER MODULE

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"in MOTM Form Factor. Original PCB design is from THOMAS HENRY
It utilizes the SN76477 to build a versatile CV source unit:
- one gated/delayed LFO (with hold function!) providing triangle and square, trigger and gate outputs.
- one noise source with selectable frequency range and sweep
- one sample & hold with portamento and attenuation

short description:
there is the LFO section. you will choose mode of operation with a switch selecting delay, gate or switch. in delay mode the LFO will start when triggered depending on the delay time - so you can create delayed modulation. in gate mode the lfo is alway on until you plug a cord in (switching jack socket). from now on the LFO is on when a gate signal is present. in switch mode you can perform a "hold". the LFO stops as soon as you close the connected (foot?)switch. a status LED above the mode selector indicates the LFO working. there is a selector for the LFO range, a rate control and a LED indicating the speed of the LFO. there are four outputs: triangle and square wave, the gate and the trigger outputs a derived from the LFO. the gate is derived from the square wave output but going from 0V to approx 10V (or whatever, depending on a resistor value). the trigger is derived from the triangle and delivers a 1ms pulse. don't forget: the output is gateable or controlled by delay or switch!

the S/H section :the S/H is clocked from the LFO trigger and provides a portamento (lag) and depth control.

the noise section: the frequency range of the noise source is selectable by a switch. furthermore there is a filter control (known from the SN voice) and a attenuated cv in for the sweep, which base is set by the initial control. you can select external or internal (LFO) sweep modulation."

MOTM PT2399 Delay Module

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"The delay time is variable from about 33mSec to 300mSec by varying a resistance. The datasheet specs a maximum 300mSec delay at 1% distortion, but we found it could go to about 2 seconds with acceptable results.

They implemented voltage control by using an LDR (yellow LED and CDS photoresistor) for the resistive element. A true vactrol could also be used. They want the resitance to vary from as low as possible (for short delays) up to about 100K. Some experimentation will have to be done with the driving current levels for the LED."

MOTM ANALOG / DIGITAL NOISE MODULE

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"This is a dual module. It does not only provide Analog Noise -- it also provides Digital Noise, S+H and VC Controllable Digital Signals. S/H is controllable as well."