I'm looking for the best practice to scratch (change playback speed quickly) large sound file.

I've already tried :

- table and tabread4~ but table length is too limited 

- readsf~ : can't change playback speed easily (I didn't try resampling with block~ yet)

- august/readanysf~ : seems pretty great but can't play backward, it also has a great feature : the return

- moonlib/sfread2~ : works with both positive and negative speed but only with 16bit audio file and quite buggy (strange output when it can't find file)

- moonlib/readsfv~ : works only with positive speed

Does someone know how to play large sound file with playback speed control (positive and negative) ?

Thanks 

Antoine