Ok there is a lot of background information but I will try to say everything as straightforward as possible. Long story short: When I take my old Video file and my new audio file with NR and create a new file the audio gets all hissy again... Alright, I shot a "tutorial"/"advert" on a Canon 5D mark ii, I used my external boom/shotgun (3.5mm jack) electret condenser super unidirectional mic for audio. That always gives me a terrible hissing sound in the footage. I've used every program out there and for my specific problem Adobe Audition works best. I can put headphones in and have the voice at a comfortable level and if I didn't know there was a hiss before I wouldn't have been the wiser. Perfect? Yes? NO... I have my original .mov video/audio file and my new, clean sounding, audio file I exported from Audition (.mp3 or .wav) So I decide to mux them together as opposed to loading them into premiere pro or sony vegas to replace the audio and then go ahead and render a new whole video. Long story short: When I take my old Video file and my new audio file with NR and create a new file the audio gets all hissy again... If someone knows a good alternative program or a better suggestion..anything, please give me a hand. I just want something easy, should I just go with using premiere or vegas and just render a clean video every time? I have samples of all of this if it may help to hear what is exactly going on. Thank you everyone.