This keyboard has in its bowels a real chipset yamaha FM 4 each operator.
To edit the sounds you do the following:
1) We choose one among the 100 pRSET wholesale: organ, bass, strings, brass, percussion and FX sounds
None really GPs, but some are compossed operator instead of 2 FM, and others 4, which magnifies the sound. Certainties FX also an LFO, white noise or a large envelope (submachine gun, mandolin, sea, sounds of space
2) If desired you just activate the function synthesizer, to change the frquence, FM modulation, attack, decay, vibrato and volume of sound. These parameters only act on one of 2 or 4 operator instead of the select. Just by pressing the function, not just reprogram the original sound with these "sliders" 7 positions.
2) we can superimpose the sound another preset (dual tone) or even her to have a chorus effect or a blend of two sounds PARALLEL. There has been only 10 000 possible combinations of up 8 FM conjuction operator instead (at a price fall of polyphony 2 marks)
T have this super cool synth with MIDI and a backup of pRSET.
It remains an FM sound synthesis research, with its limitations, but at least with real contrl pull that one little edit to some extent in real time! It changes the menus / pushbuttons more comprehensive but not practical.
What other FM synth origin of the checks of this kind?