Hi The most common way to do this is through granular playback. There are other methods, like spectral transformation and delay line manipulation. I suggest you search the forum for the following keywords: timestretch, pitchshift, granular synthesis, granular playback.

Then choose a method which appeals to you and get back to the forum.

Look for externals that do the job for you, like grainstretch~ and sugarsynth~. Try maxobjects.com, using the keywords above.

Good luck Brendan

...or my own humble time-stretcher and pitch-shifter (attached); just unzip and then open the file called freeze_main.

thanks a lot ! this patch is really helpful !

one question: is there any methods to set the size number automatically to perfect line up the fragments?