A BASS based DirectShow Audio Decoder that is distributed under the GPL: http://www.dsp-worx.de.
Tray player uses a modified version of this filter. The source code of the modified version can be downloaded here.

If you want to listen to music, free music, this stream directory is the right place for you. http://dir.xiph.org.

To play OGG Vorbis files (.ogg) you can install OGG Vorbis DirectShow filter on your computer.
You can download this filter from Xiph.Org: http://xiph.org/dshow.

You can download SlyEQ DMO Audio Effect filter from SlyDiman's home page: http://slydiman.narod.ru.
Just unzip files into folder where TrayPlayer was installed and run Register.bat.

To use WinAmp source filter you should install a plug-in appropriate to the file type which you want to play.
You can find a plenty of plug-ins for the most popular multimedia formats on WinAmp.com.
We recommend: By default WinAmp source filter looks for input plug-ins in "{Tray Player root}\WinAmp plugins" or in "{WinAmp root}\Plugins" if you have WinAmp installed.
Use "WinAmp Source properties" (from "Player options", page "Advanced" or page "Graph") to change default plug-ins directory and other settings.