Perhaps you refer to Celemony.

Andrew Rose at Pristine Classical has been using this process, in 
particular for his Schnabel Beethoven Sonata series, and the results in 
reducing wow and flutter are amazing.

He gives away a low-res MP3 file every week on his website.

Usual disclaimers apply.

joe salerno

On 12/20/2011 11:38 AM, Shai Drori wrote:
> There is a company that does exactly that only for audio recordings.
> They track the bias and derive the correct speed from that. Forgot their
> name. The demo is very convincing (as always).