On iPhone 16 Pro and iPhone 16 Pro Max, you can record a vocal layer on top of an instrumental recording without using headphones (iOS 18.2 or later). This allows you to capture a musical inspiration—add vocals or a voiceover to an existing instrumental recording, try out lyrics, harmonize with instrumental music, and more.
Go to the Voice Memos app
Tap Edit or delete a recording in Voice Memos on iPhone