I don't know how helpful this is, but apparently there's a free Winamp plugin called WinAmpJumper which may be useful.

I've not used the plugin myself but it was mentioned by George Fournaris who has used it with my Super-Nudelist program for the Pronto to control his mp3 collection. A little bit more info can be found in George's posts to these two threads:

[Link: remotecentral.com]

[Link: remotecentral.com]

I hope that's of some use to you. Good luck with the project!