MuSE is another rasta soft by dyne.org included, which lets you stream audio on the internet over various servers (Icecast, Darwin and Shoutcast) in MP3 or OGG format, so that listeners will be able to listen to your voice and music connecting with most available sound players around.
MuSE can mix up to 6 encoded audio bitstreams (from files or network, mp3 or ogg) plus a souncard input signal, the resulting stream can be played locally on the sound card and/or encoded at different bitrates, recorded to harddisk and/or streamed to the net.
A great introduction to streaming and how to operate muse is available online on http://flossmanuals.org/muse, while even more documentation can be found on its website.