I've been using the RX series. There is a piece of film music I'm restoring that had been pulled from the mixed soundtrack of a film. I've been successful in removing footsteps and other noises. I've had to use the graphic equalizer in Soundforge to bring the music out (RX is woefully missing a useful 20 band equalizer, which it needs terribly). What I ended up with is very good. The problem is that in one small part of the music there were some striations - at least in one tiny spot - with an embedded high frequency "shriek" that I can't remove without destroying that part of the music. What's also weird - and is something unbelievable - is that I removed the noise previously in an earlier version. This was by pulling a bit from another area and pasting it over. After a couple of hours - and on its own! - it suddenly reappeared again in a slightly different spot. It's as if it bleeded in from somewhere. But it really is embedded and nothing I know takes it out. There are no pastes available for that part of the music. The thing is I'm using RX9 and there is nothing I know that works. I tried "De-Bleed" but I can't seem to make it apply. This is a bit of music where a simple pair of violins are playing alone in high register. If anyone knows the answer I'd appreciate it. I've had to take out what seemed like bird shrieks and bells in the violin music. Now in the one section it's just the violin "shrieks" in the one tiny spot. Playing it in a loop and trying anything in the software that works to remove it is enough to make a person go nuts.