The Digital Chalkies and I tried broadcasting on the Sanbox Channels. It worked pretty well!
Things that worked:
We did not use Audacity at this time
Whenever you open Nicecast, you need to check your settings. Often the default settings appear even after you have reset them
Source: Choose Audio Device: Choose your Mic.
Info: Name: Put in the name of your Broadcast
Bitrate: 64 Kbps
Sample Rate: 44.100 Khz
Cpu Usage/Quality: Least (up 2 notches)
Go to Window: Show Server
I used Sandbox B so the name I chose is SandBox B