Electro-Harmonix 15WATT HOWITZER Guitar Preamp PedalThe 15Watt Howitzer guitar amp preamp is an ultra compact workhorse thats perfect as part of a portable guitar rig, or as an emergency backup and gig saver should your main amp break down. Its super flexible, like a musical chameleon, and depending on the gear you use and your style, will fit in the broadest range of genres. The 15Watt Howitzers Volume and Gain controls let you go as clean or as crunchy as you want while the Bass, Mid and Treble knobs