Crowdcast now has the ability to stream audio from your computer or external mics in the highest quality possible through a feature we call Studio Sound.
This is great for sharing music or if you have audio from a screenshare you want to pipe into the mic. It's also great for podcast hosts that want the highest quality sound to be recorded and shared in the broadcast.
It's off by default and can be enabled by clicking on the studio microphone icon to the right of the HD video icon.
Keep in mind normally we do audio processing on the sound to do things like echo cancellation, automatic gain control, and noise suppression. When Studio Sound is turned on, this processing is turned off and may cause echoing unless all participants are wearing headphones. Any guest who joins the stage can turn this feature on for themselves.
See more details here