Polyrythmic recently released version 1.1 of MouseScratcher, a VST/AU/RTAS plug-in (via Pluggo) for Mac OS X that enables you to scratch any sound with the help of your mouse (or a MIDI keyboard).

Load a mono or stereo sound file, select the part you wish to scratch, then drag your mouse across the sound: the horizontal movements enable you to move within the sound file, whereas vertical movements control output volume. Here you have a DJ's two essentials features at the "tip of your mouse".

You may also control MouseScratcher using a MIDI keyboard with the different parameters affected to notes, and to pitch and modulation wheels, or with any standard MIDI controller.

A "resistance" parameter allows you to simulate real turntable resistance.

MouseScratcher costs $28.