Sound output has been confirmed with my adapter. Although I haven't checked all functions, all buttons, knobs, and connectors responded and produced sound changes. There are signs of use, minor scuffs, and scratches. Please note: This item is a used and as-is item. Please bid with the understanding that it is a used item. Bids from those seeking a perfect condition or those who are overly sensitive are not accepted. We are not responsible for damage during shipping. Maintenance is recommended as needed. We may cancel bids from those with negative feedback or those who we deem unable to conduct a smooth transaction. No claims and no returns are accepted.