System Configuration : I/O Setup : Opening the I/O Setup : Closing the I/O Setup

Closing the I/O Setup
To close the I/O Setup and save changes:
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Pro Tools checks several settings for routing validity (to prevent feedback loops). If there are any overlapping or invalid settings, you will be required to correct them (see Valid Paths and Requirements).
To close the I/O Setup without saving changes:
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Click Cancel.