With the Inbridge Winamp Plugin you can monitor the communication between another input plugin and the Winamp host application. To monitor in_mp3.dll for instance you would rename files like this:
2.4, 2006-08-26
2.3, 2006-08-17
Added: Basic support for Unicode plugins
Added: More error output
Fixed: Core::SAAdd and Core::VSAAdd return value support
Fixed: hwndParent value was not shown for Input::InfoBox
Fixed: Cosmetic bug in EQSet
2.2, 2006-03-29
2.1, 2006-02-02
2.0, 2005-09-01