8 operator 32 ch FS (Formant Shaping / FM Synthesis) sound generator
4 individual voices for 32 ch
QFP128
YAMAHA FS1R
YAMAHA PLG150-DX
http://jp.yamaha.com/products/music-production/tone-generators/fs1r/
http://jp.yamaha.com/product_archive/music-production/plg150-dx/