An advanced filtering function that will remove most of the scratches and crackles that may be present on recording made from old worn out vinyl records.
The plugin is available in VST format for all platforms and also as an AudioUnit (AU) for Mac OS X.
The Mac OS X versions are built as Universal binaries, meaning they will work with your Intel or PPC-based Mac.

Please note that you need a VST or AU capable host software such as Cubase, Sonar, Logic, Garage Band etc. Windows Media Player, Real One Player, iTunes, Quick Time Player etc does not support this plugin.

The free Audacity recorder/editor works fine with the Roni Music Decrackler plugin.

Some audio examples are available here