This is a classic Yamaha CS2x Control Synthesizer, released in 1999. I've only checked basic sound outputs and played around for a while but it seems in good working order.
A huge and diverse sound bank and lots of fun functions - the arpeggio functions kept me occupied for a long time.
It's in generally good cosmetic shape, with some marks to the casing and other signs of use. A couple of the keys have small chips on the underside. Most notably a few knobs are missing (as seems to be common with this model) - the functions do still work, but you'll be able to find replacements knobs to make it a bit easier.
Power supply is included, fully functional, although the cable has been taped up, so could perhaps be doing with a replacement.
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A few more details:
Features
- 61 full-size non-weighted keys
- 16 MB of Wave ROM with AWM2 voices
- Multi mode: 779 voices and 30 drum kits in total[3]
- XG mode: 586 voices and 20 drum kits
- TG300B mode: 614 voices and 10 drum kits
- Performance mode: 256 preset and 256 user performances, ca. 1500 material voices for performances[2]
- Arpeggiator with 40 patterns
- 8 real-time sound control knobs
- 2 Scene memories, for morphing between sound control knob positions
- Three 24-bit effect processors (12 reverb, 14 chorus and 62 variations)
- Stereo audio input, only for mixing another sound source into the CS2x, no effects applied
- To Host serial computer interface, connecting the CS2x to a computer for sequencing purposes
- Small backlit LCD with 2 lines
The CS2x operates in two main modes: Multi and Performance. In Multi mode the CS2x can play up to 16 parts when connected to an external sequencer via MIDI. In Performance mode four of the parts are reserved as the layers of a performance, which may be played either on the keyboard or via MIDI. Performance mode allows any of the XG and the material voices to be assigned to the layers as well as to the remaining 12 parts. As opposed to the more conventional XG voices, the material voices are geared toward electronic dance music.
The CS2x also offers a TG300B (GS emulation) mode, for playing music created for Yamaha TG300B-compatible tone generators. Some of the sounds are derived from Yamaha's at-the-time flagship EX5 series. In addition, Yamaha CS1x performance dumps can be loaded to the CS2x.
The Yamaha CS2x has a silver blue or silver grey body color, in contrast to the CS1x blue body. It is immediately recognized by its remarkable left chamfered edge.