redirect application for recording

[Linux for blind general discussion]

Actually this looks exactly like what you want. Note the improvements in 
the answers below the first one that create a combined sink instead of 
the null sink. That way you can still hear the app you're trying to 
record. But you are looking for the app sink index that should be listed 
in pacmd, not the default output. Every app that is playing sound should 
have a sink listed in pacmd, and you record from its monitor. Hope this 
helps.

~Kyle