[quote="Urs"]I was bidding for FS1Rs on ebay couplatimes, but never won.
My main interest is, how do those formant things work? Are they merely bandpass filters behind each oscillator that do a similar thing as keytracking?
Or is each operator either a bandpass filter or an oscillator?
I have an FS1r in my studio. It's a very cool device indeed, but a little cumbersome to edit via the frontpanel.
Luckily there is a program here http://synth-voice.sakura.ne.jp/fs1r_ed ... glish.html
That program should be able to run without an Fs1r attached, so it can give you a good idea of how an FS1r runs internally. I can also fill you in on any other details on the FS1r, since I very familiar with it.
From what I remember there are quite a few operator oscillators you can choose from. Formant happens to be one of them... There is also a typical Sine operator and then few that are basically a sine fundamental with added odd, even, or both harmonics dropping off significantly. It basically sounds like a bandpassed saw/square. The formant is basically the same deal except that you can change the nuances of the bandpass filter via parameters. So you can basically have a wide bandpass narrow off while changing the slope of drop-off, etc. All this can be controlled by velocity, keytracking, Mod Wheel, etc. Sounds cooler than it actually is IMHO.
I personally found the formant stuff to be marginally usable and instead depended more on typical sine modulating sine type stuff. Each 'voice' (of which the fs1r has 4!) of the Fs1r can have up to 16 operators: 8 voiced (pitched oscillators) and 8 non-voiced (AKA noise through a bandpass). For most purposes, I was able to get good 'vox type' sounds without using any of the formant oscillators.
As far as FM sounds are concerned, the Fs1r is a superior to anything FM I've used in the software realm. When I started playing with the FMOps in Zebra, I immediately thought about how cool it would be to try fs1r type stuff and run it through Zebra's superior filter section.
Zebra is still overall a much more versatile synth.