raul diaz wrote:

I'm starting to learn GEM and I would like to make a patch which visualize the waveform of a dinamic input audio signal into the GEM window (something like an oscilloscope).

A few suggestions:

http://lists.puredata.info/search/PD-list?query=waveform+gem&max=20&...

or look here:

http://puredata.info/Members/tfbb/mapi/view

Thoralf says one of the output modules in this monster does exactly that:

Thoralf Schulze wrote:

MAPI (http://www.puredata.info/Members/tfbb) has an output module that does exactly this: drawing the waveform of an incoming audio signal, either continuosly or periodically. Open abstractions/mapi-out.pd and have a look at the pd __scope__ subpatch. Zooming in and out of it is also possible - at the end, it's only a bunch of spheres. I also posted something like this to the list a while ago, but this version was quite buggy ...

good luck, d.