DESIGN LABS PROLOGUE PLUS RETRO SYNTH WITH MIDI-CV GATES ETC

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"THIS IS A UNIQUE AND RARE ITEM WITH VERY FEW OF THESE UNITS MANUFACTURED. IT OFFERS COMPREHENSIVE MIDI TO CV & GATE FUNCTIONS WITH ADDITIONAL FEATURES."

You'll find some details on one previously captured here. There is a review on Sound on Sound here.

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Design Labs Prologue Retro Synth MIDI to CV Filter Module

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This is the first Design Laboratories post featured on the site.

"DESIGN LABS PROLOGUE PLUS WITH RETRO SYNTH FITTED

This is an 8 channel midi to cv convertor with DIN sync converter and a separate analogue filter, with a vca and 2 envelope generators......

The Prologue Plus has four MIDI-to-CV processors, each of which can handle four notes simultaneously. The first menu, General Control, allows the following to be assigned to each processor: a MIDI channel, one of five keying modes, LFO, clock and portamento rates, four MIDI controllers, and pitch-bend amount. The processors can be treated individually, or stacked to give 8-note poly

There are 11 Gate-type signals, derived from each of the four processors, to be assigned to any of the eight output Gate sockets. Similarly, 24 continuous-voltage signals can be assigned from any of the processors to any of the eight CV outputs. The pitch CVs can be either 1volt/oct standard or volts/hz

The flexibility offered by eight pairs of CVs and Gates is staggering. Each of the eight CV outputs is a source of continuous voltage, and the range of mapping options means that each of these can carry a pitch CV, or any one of hundreds of controller CVs. This means that in addition to driving up to eight monosynths with basic pitch and gate information, you can play a synth such as an Oberheim 4-voice or a modular synth with 4-note polyphony and four continuous controllers (such as filter, amplitude, PWM, and so on). .

The unit also offers DIN sync 24 conversion from midi clock via a 5 pin din socket on the rear. Clock pulses, start, stop and reset pulses can be routed to the gate outputs on the rear of the unit, these are very useful for runing analogue sequencers, arpeggiators, sample and holds and envelope generators etc...

The retro synth option offers a filter, vca and 2 adsr envelope generators to process external audio. The filter is based around the oberheim xpander circuit and has the following 14 filter types.

BP1 Band-pass filter 1. A wide range of frequencies is passed.

BP2 Band-pass filter 2. A medium range of frequencies is passed.

BP3 Band-pass filter 3. A narrow range of frequencies is passed.

HP1+L A 12dB/octave hi-pass filter with a low-frequency EQ boost.

HP2+L A 18dB/octave hi-pass filter with a low-frequency EQ boost.

HP3+L A 24dB/octave hi-pass filter with a low-frequency EQ boost.

LP1 A 12dB/octave low-pass filter with no EQ applied.

LP2 A 24dB/octave low-pass filter with no EQ applied.

LP1-L A 12dB/octave low-pass filter with a low-frequency roll-off.

LP2-L A 24dB/octave low-pass filter with a low-frequency roll-off.

LP1+L A 12dB/octave low-pass filter with a low-frequency EQ boost.

LP2+L A 24dB/octave low-pass filter with a low-frequency EQ boost.

NOTCH1-LP A medium range of frequencies is rejected. There is a low-frequency roll-off.

NOTCH2-LP A narrow range of frequencies is rejected. There is a low-frequency roll-off.

The 2 ASDR envelopes can be routed to the CV outputs, for use with external synth and modules.
If you just add a external oscillator you will have a complete synth with a lovely filter or you can use
the retro synth input to process any analogue or digital synth or sound source. .

This machine does nearly every kind of midi to cv conversion and will filter and process audio
it's an amazing machine!!"