More hours in the day

In the summer of '94 I sketched a design for my ideal 'mp3' player.  I didn't spec the compression format.  If I had, it would have been called a 'bit' player back then.  I wanted a walkman replacement.  However, the feature I most craved was understandable fast play, and rewind.  My motive was to record all my lectures for a day, then listen to them later in fast play, thus creating more hours in my day.

 

In 'Digital Death Lab' class, my lab partner, Gio, and I had implemented fast play as our final project.  Maintaining pitch is the hard part, you can toss pauses between words, but you can't just toss samples without making it sound like 'A Very Special Chipmunks Physics Lecture'.  I see that Windows media player 10 has fast play.  Does anyone know if mobile products expose it? 

 

Do any mp3 players solve my 'more hours in the day scenario' for a mobile device?