thank you for your answer,
I saw that this is problematic: s
for the theory, I do not really understand the difference between an analog and a FM frequency modulation. Even if I find out this difference (the amount of modulation changes the pitch of the sound on the analog one but not on the FM one), I don't find the answer on the web...
in practice, I will try on a real FM synthétiseur. are there any FM matrix synthétiseur (like FM8) in actual hardware or should I search an oldie ?