SYNERGY Engl Powerball DUAL CHANNEL ALL-TUBE MODULENever ones to ignore a classic design, Synergy reached out to the Engl Amp designer of the Powerball head, Horst Langer, to provide us with the amps signature swath of tones in an all tube Synergy preamp module. The Synergy Powerball module boasts two of the amps four channels with enough control on tap to go toe to toe with the namesake head. Not only will you find the standard 3 band EQ, gain, and volume controls, but two Gain Lo Hi and Mid Boost