Customize headphone audio levels on your iPhone or iPad ...
2021-6-9u2002·u2002To customize Transparency mode settings: Check that you have the latest version of iOS or iPadOS. Go to Settings > Accessibility > Audio/Visual > Headphone Accommodations > Transparency Mode. Tap Custom Transparency Mode and turn it on. To adjust the audio-volume balance between left and right channels, adjust the Transparency Balance slider.
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