Yamaha CS2x CONTROL SYNTHESIZER SN PH21154

via this auction

Note this is not an analog modeling synth like the AN1x but is rather has sample based oscillators.

"The second generation of the popular CS1x synthesizer is back in a bold and bright new Analog Modeling synth - the CS2x. Many new improvements and enhancements have been made. Polyphony has doubled to 64 voices and there's 16MB of sampled waveforms! There are 64 resonant 24dB filters! The Arpeggiator now holds 40 patterns for animating your sounds. All functions are MIDI capable, even the Arpeggiator can transmit its pattern data to other synths or sequencers! There is even a direct TO-HOST connector for direct hook-up to your computer..."