Pastelero has a great how to on controlling WinAmp via a serial port “Nowadays, winamp has full support to keyboard shortcuts. But some time, when winamp didn’t have this feature, I was thinking in some way to make a easy way to change music by simply pressing one button, it would make things faster and would help me to change music during games. So I decided to make a external control panel, to make it easier to change musics, volume up or down, toggle shuffle and many other features by pressing just one button. I found one winamp plugin that shows how to configure a external control using the Serial Port, being able to make 4 or 15 buttons control…” [via] Link.
HOW TO – External Winamp Control