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I have discovered after having to upgrade phone that, at least on my samsung phone, there is a setting built into the native mp3 player that allows playback speed changes. Ive used The Amazing Slowdowner for a few years, but this works just as well. This may be something useful if you dont like adding apps to phone.
@Mark. amazing slow downer still has it beat with being able to repeat sections instead of the whole track thlugh. Theres no A/B selection that allows for repeating a portion. But.. its a bit easier to find what your looking for in the way of individual tracks. sometimes i find myself searching for tracks buried down in a directory with amazing slow downer.