Output through a sound stretching algorithm
I love the ability to play at various speeds, but 150% even makes Barry White sound like a chipmonk.
There are ways to process sound that alter the pitch at the same time as the speed to compensate and make the voices and music sound right.
I see there are several android apps on google play that can do similar as a standalone processor (search: "sound stretch").
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The playback speed feature doesn’t alter the pitch at all.
Voices remain the same, but they just talk faster