In VLC for Android, i discovered an option to preserve the pitch during faster-than-normal playback:
The "requires a fast device" obviously implies that faster playback is more performant when the pitch is changed too. Why is that so?
What i've tried: Before posting this question i did some shallow research through Google. According to Wikipedia, there are several methods for faster playback of audio, the "simplest" one (Resampling) changes the pitch.