Checking an Avid HDX, Pro Tools|HD, or HD Native System with DigiTestBefore you use Pro Tools, you may want to run the DigiTest diagnostic application to ensure that all Avid HDX or Pro Tools|HD cards in the system are recognized, installed in the proper order, and have valid TDM connections. You can also use DigiTest to validate your HD Native card. See the Avid DigiTest Guide for more information.