Check the listing for details. Rocktron Multivalve Tube Series Multi DSP Effects Processor. Color: Black, Condition: Used. Listed at 425.00 USD. Here is a rare Rocktron MultiValve effects processor with tube warmth. Comes with power supply & printed manual. Works great & sounds great! Shipping to lower 48 USA only The Rocktron Multivalve Tube Series Multi DSP Effects Processor is a high-quality rack-mountable multi-effects processor designed for musicians and audio engineers. With its sleek black color and compact 1U rack unit height, this model - Multivalve - offers a wide range of DSP effects for creating intricate and dynamic sound sculptures. Whether you're looking to add some character to your guitar tones or craft intricate soundscapes for your music production projects, this Rocktron processor is sure to deliver the tools you need in a reliable and professional package.