I’m trying to playback a sound backwards. The manual says that if you were to put a negative number in mySound.setPlayRate(), it will play backwards. I managed to do this once somehow, but after a small change, I could never get it back to work, it will just not play!
I imagine that at some point in the past, the audio subsystem was more primitive - it probably read the whole audio file into memory at once. It doesn’t do that any more, now it streams the data from disk on demand, at least for audio files of any substantial size.
However, since you can’t stream a file backwards, I suspect that the ability to play a sound backwards was lost when the ability to stream audio was added.