Notice that by default the Input Device selected is Winamp. This option will simply broadcast whatever is playing in Winamp, without broadcasting any other sounds that may play on your computer. This setting is recommended for most users, especially those who simply want to stream a playlist of music without any other sources.
You may also choose to broadcast using a Soundcard Input, which will allow you to broadcast not only what is playing in Winamp but also any other sounds that you play on your computer along with your computer microphone. Advanced users may even want to setup a mixing board to the line input of their soundcard to broadcast a mix of music and voice. The Soundcard Input is especially popular among those using Shoutcast for an online radio station.
To use the Soundcard Input, you should first select it from the drop down menu. Notice that the Input Settings drop down menu has now become un-greyed.
For best sound quality, you should select 44100Hz, Stereo as your Input Setting.
Under the Mic Input field, select which input on your sound card you will be using as your source. If you are using a standard computer microphone, you should select Microphone. If you are using a mixer board, an external CD Player, or some other form of sound that is not plugged into your Microphone input on the soundcard, you should select Line Input as your Mic Input.
You should now click the button to the right of the field labeled "Mic Input" that reads "Open Mixer". This will bring up the Windows mixer which will allow you to configure your sound card. You must make sure you have checked the option under your soundcards Recording Control labeled either "Stereo Mix, Wave Mix, What you Hear, etc.). You will need to consult your soundcards documentation if you can not find a similar option.