The Audible Disease Puchi Mixer PM-1 is an ultra compact 4 channel active mixer. This no-frills mixer gets the job done with the ability to adjust the levels of up to 4 mono signals and mix them into a single mono output. The small footprint makes the Puchi Mixer PM-1 perfect for small pedal boards. Operates with a standard 9-volt DC power supply with a barrel type negative center tip. Audible Disease recommends the Visual Sound 1 SPOT power adapter.