Hi, I m new to pure data, I need to make an envelope, let s say a gaussian envelope for turning the volume of a signal up and down 1 to 40 times per second. Basically I need to make an isochronic tone. Has someone some experience of this? Thanks!!

@fabiomassimo Hello Fabio... you should look in your Pd installation folder at........
pd/doc/3.audio.examples ...... especially D14.vibrato where you can envelope a very deep fast vibrato onto your tone. The whole of the "doc" folder is worth a good read!
There are other interesting psycho acoustic patches in........
pd/doc/ manuals/Cognition
David.

reading a table is probably best, see the 3.audio.examples/B01.wavetables.pd file and audioexamples/F12.paf.pd for the bell curve table (though make sure to make it the right size with the conditions in B01.wavetables.pd).
and then feed it into the [*~] object that has the signal at the other inlet