Much of my playing is rhythmic and choppy; I use a lot of double stops. The wah just accents all those stops and chops and brings out the rhythmic aspect that much more.

On 'Metallica,' I recorded six or seven different guitar solos for almost every song, took the best aspects of each solo, mapped out a master solo and made a composite. Then I learned how to play the composite solo, tightened it up and replayed it for the final version.

The only problem I've had with my Vox wah is its tendency to move around on the floor. So now it sits on a rubber mat that says in big letters, 'Kirk's Wah-Wah Rug.'

Kirk Hammett Quotes