The CS-80R is designed to capture the sound of my beloved old Yamaha CS-60, with various enhancements drawn from the CS-80 and GX-1 designs.

Yamaha's CS architecture was implemented in four generations of quite different hardware (GX-1, SY-*, CS-*, CS-*m) in the mid '70s to early '80s in many configurations, and more recently in a popular commercial virtual synth. Each has a slightly different sound, though with similar characteristics.