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Any audio file on your device or in Files: M4A, MP3, WAV or AIFF. The vocal stem gives the most accurate scoring. A full song works too: Melo Pro separates the vocal on your device (a one-time download of the separation model, about 100 MB, the first time).

You don’t have to, but your pasted lyrics tell Melo Pro which parts are yours. Lines in [brackets] are section labels, anything in (parentheses) is an ad-lib that plays but isn’t scored, and vocals that aren’t in your lyrics (a feature verse) play without counting.

Without headphones, the guide vocal coming out of the speaker would get into the microphone. In Echo mode each line plays first, then a 4-3-2-1 count-in, then you sing it back, so only your voice is scored. With headphones you can sing along with the track instead.

After a line in Echo mode, tap See why. Next to any missed word, choose It’s an ad-lib or Not me, then Try this line again. You can also edit lyrics any time in the song’s Lyrics & sections.

Bluetooth headphones play a little late. The first time you use a pair, Melo Pro runs a short tap-along check to measure the delay, and it keeps adjusting from your runs. You can redo the check from the practice screen.

Settings › Subscription in Melo Pro has Restore Purchases and Manage. To cancel, open Settings on your iPhone or iPad › your name › Subscriptions › Melo Pro Unlimited. Cancel at least 24 hours before the renewal date to avoid being charged for the next period.

Yes, through your own private iCloud, when iCloud is on (Settings › Library & storage). We never see your songs or scores.

Purchases are handled by Apple. Request a refund at reportaproblem.apple.com.