I posted the following in the reacTiVision forum and someone toldme the next quote.
"This is about reacTiVision.

Is the following possible:

I use Traktor (DJ software) and I want to be able to setup a fiducial to represent a deck in Traktor. I would like to have a center in the reacTable and then the distance of the fiducial from the center will control the volume and the orientation of the fiducial the pitch of whatever is being played in that deck. This way I can have a max of 4 fiducials for each deck. This would help a lot.

A little explanation: Before you ask why I want to do this, let me justify. I listen to Indian Music and it is all in MP3 not midi so i don't know how to control it from the reacTable straight away, if there is a way please do tell me.

PLEASE PLEASE help me, I really want to do this. "

"You can use Pure Data ( http://www.puredata.org/ ) to load and play back the MP3 files as samples. Setting a patch up with volume and pitch is pretty easy. There may be some limits on how big a sample can be but I don't know what they might be. You can ask here=> http://puredata.hurleur.com/ It is Pure Data forum with some smart folks in it.

Bill "

So could someone tell me how this is possible.pleasehelpme.

It would be nice if someone cold post the code for i mp3 example file and I could try larn fromit and implement to other mp3s

thanks