I have tried with Ardour, Rosegarden and Traverso, so far all these DAW are better than Audacity but for one thing: they lack this functionality that lets me select a piece of noise as a sample and use it to automagically filter out the noise in all the recording¹. I have to deal with somewhat sub-standard hardware (especially with unavoidable static noise) and this prevents me from switching to a more efficient software.
So: is there a way (perhaps with plugins?) to have this functionality in Ardour, Rosegarden or Traverso?
¹ Details on the process at http://wiki.audacityteam.org/wiki/How_Noise_Removal_Works