Turn Winamp Equalizer On or Off with a keyboard shortcut, using EQ Hotkeys
If you use classic Winamp skins, just pressing the “n” button (while Winamp has the focus) toggles the equalizer on or off.
This shortcut does not work on modern Winamp skins, however, you can download this free Winamp plugin to enjoy the same functionality and even more options.
EQ Hotkeys will let you define a global hotkey for turning on or off the equalizer, and even more (global) hot keys to configure the bands!
Enjoy!