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On the subscription screen, tap Restore. You can also tap Restore purchases in Settings. Make sure you're signed in with the same Apple ID you subscribed with.
Open iPhone Settings → your name → Subscriptions → Whammy, then tap Cancel Subscription. Cancel at least 24 hours before the trial or period ends to avoid being charged.
Tap Redeem code at the bottom of the subscription screen and enter your code.
Refunds are handled by Apple. Request one at reportaproblem.apple.com.
Keep Whammy open while a video exports. You can use the rest of the app while it renders, but if you leave the app, iOS may pause the export.
Tabs come from third-party sources and vary in quality. Try another version of the song, or switch parts with the part menu under the song title.