Hi Gabriele - there are a number of online documentation sites:

https://chuck.cs.princeton.edu/doc/program/ugen_full.html#sinosc
(0) sync frequency to input, (1) sync phase to input, (2) fm synth

https://archive.flossmanuals.net/chuck/ch033_unit-generators.html

https://github.com/cannerycoders/chuckdoc/blob/main/src/program/ugen_basic.md#osc

On Sun, Jun 27, 2021 at 3:58 AM Gabriele Battaglia <gabriele.battaglia@gmail.com> wrote:
Thank you Curtis and Dana for explanations.
Now it’s clear.

Where can I read all the other meaning of .sync?
If 2 essentially turns one sin to an LFO, what other values different than 2 do?
Thanks.
Gabe.
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