My Coolsat 5000 arrived today via SatelliteAV and I have a question about the AC-3 audio requirements. Do I have to do anything special to the receiver to obtain audio for the PBS stations on AMC3. What kind of tuner is needed? and can anyone recommend one that won't break the bank? I have an older Onkyo tuner that I believe is quartz and works fine for my everyday needs. If I get a new receiver it will be used only to get the TV audio. Thanks !!!