This could be a good place to start: https://stackoverflow.com/a/68356137
The general idea is:
- Pull app from your phone as a
*.ipa
file - Rename to
.zip
since these files are ultimately just a kind of archive - Extract, explore and search for individual resource files (mp3s, wavs, aifs, etc.)
Otherwise, you might just want to record the output of the app using a cable from the headphone out on your phone to a line-in on an audio interface, sound card, etc.
things that help me: