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"Synton Syrinx BLUE edition - it is the most expanded Syrinx ever made - look at the picture for the inputs, the black edition and even the expander version doesn´t have that.
My Syrinx has been serviced one week ago and is in very good condition for it´s age!
The Syrinx uses seven Curtis chips for its VCO's, VCF's and envelopes. It has two analog VCO's, a sub-oscillator and three flexible VCF filters. You can switch between the three filters for either a 24 dB lowpass, or two bandpass filters, and they can be patched in four different ways (series/parallel). Additionally the Syrinx has two LFO's, FM, PWM, osc-sync, 2 ADSR envelopes, ring modulation, portamento and a cool touch-pad that can control various parameters from pitch-bending to the LFO rate. The Syrinx's Mixer section lets you adjust levels for each VCO and the sub-osc as well as the Noise Generator and Ring Modulator."
via Benjamin.