Look for the Pitch or Frequency slider. You will usually see a display of Semitones (st) or Cents . One semitone equals a 6% frequency change.
Open the app and tap Load Track or Import . Navigate to your internal storage and select an MP3, WAV, or M4A file. audio frequency converter apk link
But with hundreds of fake links and malicious websites promising "free converters," finding a safe, legitimate can feel like searching for a needle in a haystack. Look for the Pitch or Frequency slider