I am a new user and have gone through the set up process over and over and cannot solve an audio problem. I am using an Asrock Vision 3D-137B HTPC playing WAV files and has the Realtek HD audio. I am using the 5.1 analog outputs directly to a 6 channel power amp and then to 5 speakers and a sub. The system works fine (in 5.1) doing the windows sound test or if I use WMC. Once I set up MC18, it seems the level of the 5 main speakers is reduced somewhat and sub is almost muted (except for a barely audible muffled and distorted sound). I have made sure all the room correction and effects are turned off in the Realtek sound manager and have tried almost every combination of sound output (default, direct, wasapi, ...) on the MC18 as well as different bass management options. The only way MC18 seems to sound "normal" is in 2 channel stereo. I am on my trial period now and would really like to make this work in order to go ahead and purchase it. Help please?