This Antares AVP-1 vocal producer is a great device, but it doesn't come with a power supply. There's a minor issue where one of the rack ears is slightly bent, as shown in the photos. Despite this, it can still offer excellent vocal - producing performance.

To use the Antares AVP-1 vocal producer, first, you need to connect it to an appropriate power supply as it doesn't come with one. Then, connect your audio source to start using it for vocal production. When using, pay attention to the slightly bent rack ear. It might not affect the performance, but handle it gently to avoid further damage. For maintenance, keep it in a dry and clean place. Wipe it with a soft cloth regularly to keep it dust - free. Also, make sure to disconnect it from the power supply when not in use to prevent any potential electrical issues.