Antonelli 2610 Solista IV 70/80

via this auction

Update: you can find a demo of one posted here (via the comments below)

"There are not too many synthesizers from seventies/eighties which are not demoed on Youtube. Usually it means that it was limited production... and it was something really good. Antonelli 2610 Solista IV IS really good, indeed. And it's rarity what means it's really hard to find another one at market.

It's a full analog instrument with three sections:
- drum machine
- auto accompaniment (bass and accords)
- preset synthesizer

As for drum machine it sounds really oldschool, like a locomotive which puff, buzz and doing strange things. If you know Kraftwerk or Jarre you understand what I mean. Accompaniment section has recorded waveforms synchronized with drum machine. Transposition of waveform is being made by playing at left side of keyboard. Synthesizer offers 10 presets, which you can freely link together, vibrato with speed button, delay function and something special - PHASER

This phaser deserve for individual discussion. It's effect which could be mounted in some best of the best analog synths of all time. For sure - it isnt boring fuzzer. It sound really clear and contour. Beautifully "sift" sound. After turning on phaser, delay and few presets Antonelli generate unique string-like sounds.

Antonelli is in very good condition. It plays with no problems, case is well groomed, white and clear keyboard. The only fault is that some of function levers are incomplete (see photos)."