Computer CDROM pitch

I was pondering, What would it take to create a variable pitch mechanism on computer CDROM.
(I'm thinking low-tech here using the internals)
Can you "fool" it by altering one of the clocks or does it become an elaborate splitting of clocks and altering some inputs.

I know one can do it outboard , lots-a-ram, sampling etc but as a "hack"?
D