A monophonic analog synthesizer with a 37-note keyboard. Released around 1973-1975*, being Yamaha's first keyboard synth not counting the GX-1 prototype.

The SY-1 offers a single VCO, resonant high- and low-pass VCFs, one VCA plus an LFO. Other features include a slide effect and limited pressure sensitivity (wired to the VCF) on the keyboard.
28 preset instruments are included, with no real programmability available. The user does have some limited control over the presets though: the low-pass filter's cut-off and resonance are adjustable, as well as the LFO's rate and delay. The VCA offers sliders for the simple AR envelope generator.

* All of my sources claim a different year. Anyone with solid information, /msg me!

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