Thank you for viewing. This is the Roland SC-D70 Sound Canvas sound module. ◇ Condition I have confirmed that it outputs sound from a PC like a DAC or audio interface by connecting it to a PC with a USB cable, and that it can play sounds by sending MIDI data to it. All knobs and buttons have been tested and confirmed to work. There was no scratchiness when turning the knobs. The knobs and buttons are not yellowed; they are originally a gold color. The main unit shows some scratches and dirt. The main unit and power cable are included in the listing. ◇ Comments This is a device that combines an external sound source/hardware sound source with a DAC or audio interface. Specifically, it is a device that adds a USB audio interface to the SC-8820 sound source. The ability to connect via USB is very convenient and easy to use. I confirmed its operation in a Windows 11 environment, and it worked with the Vista 64-bit driver from the Roland official website. How about it? Thank you for your consideration.