Audio Streaming from OS

Have a look at the "Graphics and Audio" and "Audio" sections of http://go-lang.cat-v.org/library-bindings.

Especially the bindings to PortAudio (http://code.google.com/p/portaudio-go/) and PulseAudio (https://github.com/moriyoshi/pulsego/) could be of use to you, being a linux guy.