I'm a little confused about Dolby Pro Logic II. This is what I have found out so far, but I would appreciate some clarification: 1. DPL2 is a way of getting extra channels from a stereo analogue source, but where DPL only gives a limited frequency mono surround channel, DPL2 is full frequency stereo. 2. If something says "Dolby Surround", like a VHS tape or NICAM TV broadcast, it has a soundtrack mixed for DPL receivers. 3. A Dolby Surround mix will however sound better using DPL2 decoding, but not as good as a soundtrack mixed specifically for DPL2. Are there any films released on VHS with a DPL2 soundtrack? I don't know, don't buy VHS anymore. 4. A soundtrack encoded with DPL2 will play correctly on a DPL receiver, but will not sound any different to a standard Dolby Surround soundtrack. 5. DVD players will downmix Dolby Digital 5.1 to Dolby Surround for the stero output. There is no point in downmixing to DPL2, because receivers that do DPL2 decoding usually also have DD. 6. If a DVD is played on a PC, there are programs (AC3Filter) that can downmix DD5.1 to DPL2. 7. You can, in theory, rip the AC-3 (Dolby Digital) soundtrack from a DVD, and encode using DPL2 to a stereo WAV file. But there is still some discussion whether, if you back up this file to a compressed format like MP3, the compression encoding will affect the surround encoding.