I'm using Delossifier for months and it does a great job when filling holes in the central part of the audio spectrum. However, when it comes to stereo difference signals, most of the holes are still there. This isn't such a big issue with MP3s encoded with LAME, however, other encoders such as the one from Fraunhofer (used in software such as Adobe Audition) tend to create large amounts of holes in difference signals which Delossifier seems to have trouble dealing with. Are there any chances to make Delossifier fill these holes as well?
To illustrate what I'm talking about, I've opened some heavily compressed MP3 file in Audition Here's what I did: Effects -> Stereo imagery -> Stereo expander -> set Center channel pan to -100% (this will result in center part being placed in the left channel and the difference signals being placed in the right channel)