When you use the downconvert HD Audio in TsMuxer, does it not extract AC3 core from True-HD and DTS core from DTS-HD and make it ready to be encoded? For what ever reason, when I open the audio in TMPGEnc Xpress it says it doesn't support it the audio, and I have to reconvert it using eac3 to AC3, and then Express opens it with no problem. What am I missing? Is not doing this extra converting degrading the quailty of my audio?