Avid HD I/O Digital Expansion Card Expand your I/O capabilities with Avid Pro Tools|HD Expansion Cards. Sound quality is king in the studio and Avid went to great lengths to make sure this new generation of I/O cards are the best sounding yet! For starters, these expansion cards sport all new convertors that are even better than the previous incarnations. Then Avid decoupled the power supply from the convertors, further enhancing sound quality and decreasing jitter. When coupled to your choice of compatible Pro Tools|HD interfaces (and their sonic enhancements), the world's leading audio production system just got better! This is an Avid Pro Tools|HD Expansion Card for adding additional digital I/O.