Christopher, forgive me writing. This is a complex topic. There is no noise reduction pluggin or system on the market, that does not vary the original source audio. Can the varyation be heard with the human ear? Depending on the cost, and you can pay thouzands of pounds for proffessional software, the varyation may be more acceptable than with less expensive packages, but not always necessarily so.
Depending on the frequency of the unwanted noise, will determine how the overall bandwidth is effected, by cutting, or reducing these frequencies. But the software is more clever than that, and works by sampling and re-sampling techniques and much much more. The question you need to answer, is What noise do you want to reduce, or remove. Can you use equalization techniques to useful effect? Are their any third party pluggins that you could introduce to your existing toolbox? There is a jazz programme I listen to, and a large amount of the music is from 1930 and later to say mid '60s. Much has been attacked with enhancement and reduction software, and sounds, to my ears, totally ruined. A false top end, say for Cymbols and other instruments of that frequency range, and a varying top end that vanishes and comes back during the playing of the track. Middle frequencies, 440 Hz and below, are often sounding false depending on the instrument playing. There is extra cibilance added to the human voice when it is recorded with a high quality microphone and the top end is lifted to a false summit. The problem is made worse by the narrow bandwidth and compression used by the bbc stations which cary this particular programme. Our digital broadcast media is offering us verry poor quality audio. If this were picture broadcast, the mailbags would be overflowing with complaints about poor visual quality. As listeners, the digital revolution has left us with some verry poor audio indeed. Hope you sort it out to your satisfaction, after all, that is all you need to do. Satisfy your own ears, it's your music, and you have to listen to it. Kind regards and good luck, Joe -- Joe Paton <j...@vi-ability.demon.co.uk>
