Totally Wycked Audio TWA Mk. III Triskelion Harmonic Energizer Review Evolving from the Systech Harmonic Energizer as used by Frank Zappa, this parametric midrange filter boasts adjustable peak control and obscene amounts of gain. Get The Pick NewsletterAll the latest guitar news, interviews, lessons, reviews, deals and more, direct to your inbox!Contact me with news and offers from other Future brandsReceive email from us on behalf of our trusted partners or sponsors MOST READ1How Duane Eddy wrote his twanging, game-changing instrumental smash, Rebel Rouser2Instrumental guitar legend Duane Eddy has died at 863Why Eddie Van Halen stopped throwing guitar picks into the crowd4Mark Knopfler says he had begun planning to record an album with Jeff Beck shortly before Beck's death 5Donner Triple Threat review