[Vorbis] problems with various settings

[Raymond Grote]

Hi, my name is Raymond and I'm new to this list. While I think Vorbis sounds good with its "quality" settings, I have a few problems when I set the format to constrain the bitrate so it doesn't go any higher than 128KBPS, for example. This problem only occurs with stereo files, not mono. Let's say I set the format to use bitrates up to 45KBPS. Well, the low-pass filter has this problem, the closer the volume gets to 0DB, the lower the cutoff, by 0DB I think it's around 4KHZ cutoff but when the volume gets quiet it sounds like the cutoff is where it should be. The higher I let the bitrate go, the less the lowpass filter acts up, by 80KBPS I can't hear anything wrong with it. On the "dare to compare" section of the vorbis site I heard none of these low-pass problems. I'm guessing that the codec got installed automatically with the program I'm using and it was a beta version, or it was corrupted? The company said another customer reported the same problem. Maybe I can just re-download the codec and install it somewhere, but I'd have to know where to put it since I do not want to go replacing files without knowing what I'm doing first. Or isn't it that simple? As you can tell I'm kind of confused...
Any advice would be greatly appreciated.
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