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Unfortunately, that feature is not going to happen.
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For adjusting volume, you’ll need to modify the file on your computer before importing it. Lowering the level of a backing track will also affect all overdubs, so they will be quieter as well.
3 and 4: For more information regarding screen readability in daylight conditions, please see this link: Screen Readability in Daylight Condition.
Thanks again for your understanding, and feel free to reach out if you have more questions!