It keeps the volume level of your vocals even without flattening the harmonic dynamics like a compressor and won't bring up extra noise like an expander. They also make a Bass Rider, but I'm pretty sure you can use the Vocal Rider on guitar leads.
I'll be downloading a copy right after I finish typing this public service announcement.
Walt wrote:But when the hour is nigh, and the lights are low, and I got a little toothpick of a shwag joint in my teeth, and my friends want to hear me play "Into the Void", or "TNT", "or "Cemetery Gates"...I plug my 600 dollar guitar into my 150 dollar amp, and I am a Rawk gawd.