FM synthesis has synth 80s. It has less than the DX7 algorithm, which saw its original price at the time (around 5000 francs) was not warranted at all.

UTILIZATION

To create a sound that is not only a headache but more often we get sounds that sound yamaha DX27. You really have to look far to find sounds that are nice to the ear and a little warm. That said it is still possible with patience (it takes, like all machines of that time Yamaha FM).

SOUNDS

It is possible to find a nice sound. By programming I find many of his electric keyboard that was not too cold, despite the tone metal.
To the sounds of marimba or percussion type bell it is also particularly comfortable.
Good even when the interest is to make possible the strangest sound, unlike anything that comes to mind was the limits of the machine, or why not using a background the cold side.

OVERALL OPINION

I sold it and now I have keyboards nicer but I still used a lot of time, with sounds that I developed it myself of course. (Avoid too much sound factory Yamaha FM synthesis stamped)
I think for ca 50 euros can be worth it for it is a solid machine that has a large keyboard and, if one has the patience can yield some surprising sounds.
By or against the price it was sold at the time it was not the case.