I have confirmed the sound output from the mixer/headphones using a DC supply. It has been in storage for a while, so there may be some crackling. Please consider this with the understanding that there is no warranty, refund, or return. I usually use a SansAmp and bought this for variety, but I don't seem to use it, so I'm selling it. The packaging materials are recycled. - Brand: OneControl - Model Name: Sonic Silver Peg - Control Knobs: Volume, Tone, Mid - Connections: Input, Output - Design: BJF Design Thank you for looking.