Amazon.com: HQRP 9V AC Adapter Compatible with Alesis P4 AC09 25D 4-pin DIN Connector 9V AC Power Supply Replacement QSR DMPro Drum Machine MIDI Data Disk Quadraverb GT Quadraverb Quadraverb 2 S4,
Alesis Quadraverb GT - Esse Music Store
Synth Secrets of the Alesis Quadraverb - YouTube
AC Power Adapter for Alesis Quadraverb, GT, Quadraverb 2 S4, QSR, P4 AC09 25D | eBay