THE 5 KNOBS ULTIMATE BENDER Are you tired of your old tone bender being a one-trick pony? Do you want to get the most out of your sonic abilities and be able to search for different tones for the mix every time? then RTV is your man! The Red Top Five is based on the Tone Bender MKII and the Marshall Supafuzz, adding a series of modifications and changes that make it the ultimate professional fuzz.