MasterMuxer is a powerful DSP Plug-in muxer for Winamp. It supports up to 9 DSP plug-ins, has an optional WatchDog function to automatically press Play after X seconds of inactivity (perfect for relaying), and it can output the currently playing song name to a file!
It reads the configuration from an ini-file based on its own filename, so you can make copies of the dll to have multiple configurations easily accessible.