For noise reduction Adobe Audition is the precision tool. (aka Cool Edit, which may still be around in some form, but pc only). --In "arrangement view", Copy/paste portions of audio files across a workspace in an arbitrary manner (where I can decide whether or not they sync up with the existing tracks).Audition's perfect for that too.
...but it's not intended for live use, I don't even know if it would be practical to host a looping plugin with it in a live situation. However, I think the rest of your requirements would be met by using Mobius as a standalone. (not 100% sure) andy Matt Davignon wrote:
Hmmm, that may be a deal breaker for me. I'm not asking for real-time noise reduction, just the ability to de-hiss tracks once they're recorded.I was like: So, no noise reduction, huh?