Discata plays music files you own. In the Library tab, tap Import music and choose files from the Files app or iCloud Drive. Discata keeps its own copy, so your library still plays offline. Songs from Apple Music or other streaming services cannot be imported, because they are protected.
Go to About → Ads and privacy → Remove ads forever. It is a one-time purchase, not a subscription, and it works on all your devices signed in to the same Apple Account.
Open About → Restore Purchases while signed in to the Apple Account you used to buy. If the purchase is still pending (for example, Ask to Buy), ads stop as soon as it is approved.
Go to About → Redeem Offer Code and enter the code in Apple’s sheet.
Go to About → Ads and privacy → Ad privacy choices. To change tracking permission, use iOS Settings → Privacy & Security → Tracking. See the Privacy Policy for details.
First from your files themselves. If you allow online look-ups (About → Online lookups), Discata asks MusicBrainz, the Cover Art Archive and LRCLIB using only the song’s title, artist, album and length.
Try switching the sound chain off and on from the Sound tab to compare with the original, lower strong EQ boosts, or pick a different room. The in-app Listening Guide (Sound or About) explains each setting.