[alsa-devel] capture sound from an app and send it to an other app

Hello! I'm trying to find help to do something that shoul allow me to capture audio stream outgoing from an application and redirect it to an other as audio stream input. It like to do it for different istances of the application (an instance generates out - the other take input, this many times). how to do so? What i should do? And how?

Thanks,

Marco