Using Ambient Mixer with Google Hangouts and Roll20

Hey guys, I've been searching all over and cannot find this answer. I use Roll20 in Google Hangouts for our game, and I'm trying to find a way to play things like  Ambient Mixer through the audio along with my mic. Anyone have any clue how to make this possible? I've seen some things suggest that some kind of mixer software may be needed, but I can't find a tutorial on how to set it up. Please let me know if you have ideas on how to make this work.  Jukebox is ok... but I prefer just ambient sounds, and those are rare through soundcloud. 

Ron. Roll20 has added a new feature to the audio tab and it is called "tabletop Audio" which is loaded with a variety of ambient music. Here is the  blog about it and the  wiki has a bit also about how to access it. You also can go to soundcloud itself and find what you want by searching there then copying the url over to the roll20 jukebox so it will load it.

Oh, thank you very much! I'll look more into both of these. :)