This page is a comprehensive list of Yamaha chips and what products use them. My guess is this one: YM2414(B) (XB768001) OPZ "OPZ Operator" Excellent Sega Megadrive-ish tone generator. Requires external DAC - YM3012. Electone HS-8 has five of these inside (besides GEW1). DSR-1000, DSR-2000 , DX-11 ...

Hi,
I have a Yamaha DSR-2000 synthesiser/keyboard, and I'd like to identify what FM synth chip it uses, preferably without disassembly. I know it's 4 operator and seems to have more than 10 voices, but nothing else beyond that. Any ideas?

There are a lot of synths available on Linux, my personal favorites (all free): Zynaddsubfx - very powerful, but has a complicated UI Helm - open source synthesizer, lots of modulation options Amsynth - analog modeling synthesizer LMMS - sequencer/DAW with some nice built in synths JUCEOPLVSTi - OPL...