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

Syrinx Synth

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. 
This makes the Syrinx very flexible 

Manual

Schematics

Modifications 
We have sold syrinx with an EH instant replay. 
The syrinx was modified for using the with the instant replay. You can play the instant replay with the syrinx and the output of the instant replay is processed by the syrinx. Instant Replay 

There  are also modified syrinx with extra CV inputs for the filter frequency and the ADSR parameters, Audio input for the filter, CV input for controlling the modulation from the ADSR to the filter and VCA, CV input for the touchpad. 

A final series of six Syrinxes was made after Synton went out of business. 
These were mounted in flight cases, and had no keyboard 
The Syrinx uses seven Curtis chips for VCO’s, VCA, RM, VCF’s and envelopes.