We lost one of our dearest friends on April 15th, 2017. Holdsworth used Quilter MicroPro Generation 1 Stacks. Each of the MicroPro Gen 1 12 inch combos drove an extension speaker for a 4x12 inch configuration. These he placed atop an additional pair of Quilter Extension cabs which were driven by a QSC GX7 amplifier for his synthaxe amplification. When touring overseas, Holdsworth used two Quilter MicroPro heads for guitar, and two Quilter Tone Block 200's for Synthaxe.