I have a Creative Sound Blaster Audigy 2 sound card in a 7 yr old Dell Dimension 8400 desktop, running Win XP.

In Audacity there is a drop down menu where you select the source of your recording.
The Audacity menu shows various SB Audigy Audio sources such as CD, Mic, MIDI, and "What You Hear".
I also have a Lineport UX-1 interface which also shows up in the drop down along with MS Soundmapper.

If you select (SB Audigy Audio(C8C0):What You Hear) Audacity will record whatever you hear coming out your speakers or headphones, such a sound from a youtube video you may be watching.

I've done it before in Audacity, though I am having trouble getting it to work there now for some reason.
Just wondered if there was a way to do the same thing in Realband.

Due to space constraints I can't really do a good quality sound proofing job and most of the time it's adequate for vocals, until the dog barks.
All my instruments go direct line in through the UX-1 so that'snot a problem.

Carkins