www.tunnelvisionmusic.com - The ZVex Vextron Distortion features the same distortion circuit as the Box of Rock with the addition of a gain boost switch and a sub frequency control switch. If you have been wanting the sound of a Marshall JTM45 non-master volume cranked up but havent been in a position to spend $2000, the ZVex Vextron Distortron could just make your dreams come true. The knobs are self explanatory and control Volume, Tone and Drive. The sub switch adds increasing amounts of ...