Any Dolby Prologic Filters?

[pagokoftis]

Hello.Is there any Dolby Prologic Filters like AC-3 Filters?I make the sound of my movies either 5.1 or 2.0 AC-3 with Softencode, having downmixed the 5.1 channels to 2.0 with DSEnc and afterwards compress it with Softencode to AC-3.Hearing the audio files with PowerDVD was the same as listening with AC-3 Filters, but when I enabled the Dolby Prologic II option in PowerDVD then the sound was like 5.1!!!Thanks for your time and...sorry for my bad English.