It depends a lot on the software. Try antennapod on android or windows media player on windows. It's a really difficult problem and actually all the on-the-fly

It depends a lot on the software. Try antennapod on android or windows media player on windows. It's a really difficult problem and actually all the on-the-fly things don't do it really well (at some speed vocals blur in to consonants and consonants get clipped. good software that has no simple FIFO algo can do it much better (conserving consonants etc.).