Avid Pro Tools I/O AD Option Card
The Avid Pro Tools HD I/O AD Option is a module for the Pro Tools HD I/O Interface. As your needs grow or change, you can easily add more analog inputs, analog outputs, or digital I/O by installing an option card. You can install one option card in HD I/O 8x8x8 and up to two in HD I/O 16x16 Digital. While HD I/O 16x16 Analog comes with the maximum four cards, you can customize your I/O by swapping out any card. The Avid Pro Tools HD I/O AD Option adds 8 high-fidelity analog inputs using DB25 connections.