Trtjazz
Agreement .I use myself a sampler Yamaha to replace the sounds of bass, bass-drum and other on my ketron.Bass harmonics sounds very poor on Ketron this is my opinion
Svpworld
This is not sure . The flutes of organ use others oscillators
192 . It seems me
Fortunately for 9000 and 9000Pro all the sounds do not use 8 oscillators
The real polyphony depend of the choice of the sounds used
On Tyros nothing of that 128 polyphonic keys