This is a PYE comp clone from Pynamic 500, an Australian manufacturer. They mainly produce 500 series type units, and this is a 2-channel rack-mounted model. PYE comp clones are not often seen in Japan, so I imported this from Australia and converted it from 240V to 115V for use. I'm selling it because I don't use it much anymore. Here is the manufacturer's page: https://pynamic.com.au/product/pynamic-4062-pwm-compressor-2u-rack/ The appearance of this early production model differs from the current specifications. There are not many scratches, and the operation seems to be fine. The switch cap for the limiter mode is missing, so you need to use a thin rod like a screwdriver to press it. Regarding the sound, it's subjective, so please understand that it's non-refundable and non-returnable unless the power doesn't turn on or no sound comes out.