The SOLOIST [String Singer] is side ‘A’ of the Duellist Pedal in Black. The Unique Tone of Side ‘A’ of The DUELLIST A Reinvention Of A Classic Overdrive, Bringing New Powerful Features Top Mounted Jacks True Bypass Carefully Matched And Selected Components High Quality 4558 Chips A Unique And Highly Sought After Pedal 100% Hand Wired Stunning LASER Engraved Control Panel ‘Edge’ and ‘Glass’ adds a glassy, hollow, tube’y bite to your tone ‘Body’ Adds Back in the Low End That Many Overdrive Lack (this replaces the ‘FAT’ control found on the Duellist) 9-18 volts Battery or DC Supply Built To Last A Lifetime