PreenFM > preenfm2 and preenfm3
FM Questions
ItalianOx:
I thought it might be nice to have a dedicated thread where people can ask any questions they have about FM synthesis, especially how it works on the PreenFM, and hopefully answered by wise sages of the forum. We can also share resources for more information that people can study on their own.
I'll start with one of my own: so when you press the Algo button you get the IM (Index Modulation) page. IM is the amount of modulation from one operator to another, yes? The biggest question I have, though: what is the "v" on the IM page? Volume? I've never seen IMs until I found the PreenFM, is that because a lot of "FM" synths (DX7, FM8, etc.) use phase modulation?
Here's a great book on FM synthesis (technically PM): http://yates.ca/dx7/The%20Complete%20DX7/The%20Complete%20DX7.pdf
It was written for the DX7, but there's still a lot of great information for anyone interested in making FM sounds (which should be everyone on this forum!)
ItalianOx:
Oh, I have a couple more! Is there a quick way to turn off operators in the PreenFM? Or do you have to go the IM page and turn all the values to 0?
clément:
Hello, the "v" is for "velocity", it determines how much the according IM is responsive to keyboard velocity.
To turn an operator off, just set the wave of the operator to "none". I suppose that should do the trick?
Xavier:
Most FM synth, use the volume to modulate more or less the follwoing operator.
With the preenfm, you have direct access to IM : Modulation indices.
That's a bit different, just closer to FM theory.
I just added a line that was missing for v : v = velocity.
http://ixox.fr/preenfm2/manual/synth-edit-mode/
v is the amount of modulation that is injected by the velocity of the note you pressed.
You can silence an operator by selecting "none" as its shape.
Xavier:
Clement beat me ;)
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