Frap Tools 321, Three-Channel Module, Available per channel: +6 dB level boost, Phase inversion, DC-offset potentiometer, DC offset generator works as a CV source as long as there is no cable in the input, Total output with -6dB attenuators for audio and self-generated voltages, Auitable for audio signals and control voltages, Width: 6 HP, Depth: 38mm, Power Requirement: + 48mA (+ 12V) / -48mA (-12V)