Syrinx

The Syrinx is a monophonic analog synth. It has no Midi and no presets.
The Syrinx is actually Syrinx 2, the first syrinx, called Syrinx 716 (1973) never came out.
The first serie has a black painted bend pad and it was presented at the Firato fair (amsterdam) in
red, white, (blank alu) blue and orange. The later models has a blue bend pad.
The colours were blue, red, black and grey with white text.and some other color combinations

Some links and sound examples

Article from Electronics & Music Maker, June 1983
Vintage-Analog: Synton Syrinx Analogsynthesizer (1982)
EMEAPP SONIC TEST DRIVE: SYNTON SYRINX Feat. DON SLEPIAN
https://greatsynthesizers.com
synth-db.com/

Syrinx patchsheet Filters: Three VCF’s.
The three filters can be switched in various ways.

Manual

Schematics

Modifications
The only modification Synton performed itself was an adaptation for use with anEH instant replay.
The Syrinx was modified so that the Instant Replay (sampler) could be controlled via the Syrinx, with the sampler's output signal subsequently processed by the Syrinx's filter and VCA

In addition, third-party modifications have been carried out in time
such as CV inputs for the filter frequency and ADSR parameters,
audio input for the filter,
CV inputs to control the modulation from the ADSR to the filter and VCA,
CV input/output for the touchpad.

Some units are also equipped with MIDI, likely via a MIDI-to-CV converter

A final series of six Syrinxes , with the original PCB and frontpanel,. were made long after Synton went out of business. These were mounted in flight cases, and had no keyboard .
However the keyboard interface is still there for a keyboard with a a resistor network.