> This is a job for CoolEdit/Adobe Audition isn't it? You take a noise > signature from a part with just hum/noise and no musical content and > then use the noise reduction over the whole track. Well that's not done with phase cancellation (because as mentioned, that is next to impossible). However what happens is that the frequency aspects of the noise are analyzed and a filter is based on that. > Sorry I haven't > seen this feature in Logic Audio. Try Sound Soap (commercial 3rd-party plugin). It does this and more. Maurits.