et si yam' ressortait la fm en hardware .....

Pour avoir un peu de précisions sur l'histoire des % de modulations ,la limitation à 100% des vco analos et le through zero du zeroscillator :

How much linear modulation is possible?

A conventional VCO is capable of 100% linear modulation. If its running at 1KHz,

you can take it up much higher, but you can only take it down to zero. (Most

VCOs restrict the range of the linear modulation input, so you can't even realize

100%). At 1KHz, it can move downward a maximum of -1KHz. At 90Hz, it can

only move -90Hz always 100% maximum. This is not the case with the ZO. No

matter what the operating frequency, you can modulate several thousand percent

because the ZO can go through zero and into negative frequencies. Just what

negative frequencies are is beyond the scope of this instruction sheet, but if

your"e interested, the Cyndustries website has several links to some good

explanations.

Here's the nut--

The range of modulation that is possible has to do with the bias level and the

highest voltage available in the module. Op-amps saturate at about 13.5 volts on

a 15 volt supply (10.5 on a 12V supply). So, if you are using HIGH bias on the

switch (1 volt), then you can modulate 13.5 / 1 = 1,350%. If you are using LOW

bias, then you can modulate 13.5 / 0.2 = 6,750%!!! As you can see, the

modulation range is the ratio between your idle setting and red-line (Will this car

analogy never stop??!). At zero bias the modulation range is infinite, but that

makes my brain hurt so I promise never to mention it again.