antelope audio Zen Quadro Synergy Core This listing includes the main unit, one activation guide document, and a USB-C cable. The unit has no noticeable scratches and appears to be in excellent condition. There are no operational issues. The unit has been deactivated and will be shipped as such. The sound quality is outstanding, and it holds its own against even the latest high-end models I own. Recording quality is also excellent. However, due to the USB connection, I couldn't achieve the low latency needed for real-time performance with soft synths, compared to the Thunderbolt series. Therefore, I've reluctantly switched to a previous-generation half-rack Thunderbolt model for portability and am now selling this unit. That being said, the latency is still excellent for a USB connection, so it's a great choice for those who aren't overly concerned about that aspect. Antelope Audio