Pitch-true slowdown
Slowing down changes only tempo, never the key — the single most important thing in a practice player.
Practice
Learning a song by ear needs two things: slowing the fast parts down until every note is clear, and looping one bar hands-free. Otoha changes speed without changing pitch, so what you hear is the note you play.
Speed control and loops are free. Your files stay on your phone.

Slow down, loop, move on bar by bar.
Bring the song into Otoha. MP3, M4A, WAV and other common formats work.
Step from 0.75x down to 0.5x. Pitch stays in the original key, so notes map straight to your fretboard or keys.
Set an A-B range on the bar you are learning and let it repeat. Jump back a few seconds instead of scrubbing.
Slowing down changes only tempo, never the key — the single most important thing in a practice player.
A-B repeat jumps back cleanly so your practice rhythm is not broken.
Each file keeps its position and your speed setting for tomorrow's session.
Import the song into Otoha and drop the speed to 0.75x or 0.5x. Pitch stays unchanged, so the notes you hear are in the original key.
No. Otoha keeps pitch constant, so at 0.5x the notes are the same pitch, just slower.
Yes. Set an A-B range and that section repeats automatically — ideal for working through a solo bar by bar.
Not currently. Speed changes always keep the original key.
Speed control and loops are free. Your files stay on your phone.