Check the listing for details. AVID HD MADI Interface for Pro Tools HD. Condition: Used. Listed at 300.00 USD. Here is a description from ebay. The AVID HD MADI Interface is a high-quality audio interface designed specifically for Pro Tools HD users. With the Avid brand name known for its superior audio equipment, this model offers seamless integration and top-notch performance for musicians and producers. The HD MADI interface ensures high-quality sound and reliable operation, making it an essential tool for any professional audio recording and production setup.