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Based on the structure and features of a single voice (no layering/splits) of the Yamaha CS70M, but given an appearance more like that of the CS-80. The 70M was I believe, the last subtractive synth just before the release of the DX7.
Similar to the CS-80 this has two complete VCO-VCF-VCA 'synthlines'.
The ability has been added for each Channel's Sine to FM the other; the depth being controlled by the Filter EGs. Also more waveforms, extended 'Footage' ranges and filter keytrack which the CS70M inexplicably lacked.
Probably it's most interesting feature was it's dedicated Wheel/Aftertouch LFO in addition to the main LFO. The main LFO's controls are a bit unusual, so be sure to read the 'Info' box and maybe refer to the included CS70M manual.
This is a stereo instrument with 'synthline I' going to the left channel and 'synthline II' going to the right, with stereo separation continuously-variable.
The included 'Ensemble' effect isn't great - you'll probably want to use an outboard chorus.
Clicking on the panel's 'INFO' button will display helpful hints.
This does NOT emulate or model the actual sound of any Yamaha or any other vintage hardware synth, just borrows from the control design, layout and panel design of the CS70M/CS-80.
32-bit, so will require jBridge, etc., (or a DAW that will bridge) for use on 64-bit systems.
The link on the website is to a Sync.com folder that also contains the .osm Synthmaker source 'schematics', so anyone with SM, or it's successor Flowstone, can alter it to suit. It's hoped that anyone who makes significant improvements will share the result with everyone.
As this was originally built for my own use only, there are no presets included; I wanted to come at the instrument anew each time, as one did with vintage analog hardware.