I have some Keyboard Maestro macros set up to adjust audio input/output and open any relevant apps when docked at my desk or plugged into my USB-XLR interface for recording. However, if the computer is asleep when the triggering USB device is plugged in/unplugged, the macro gets cancelled and never runs. Is there a way to say "if macro fails, run it when next available/when computer wakes from sleep?" Sorry if this is a dumb question, not sure exactly how it would be phrased so had a hard time searching for anything like this! Thanks 
As far as I know there isn't an "if macro fails then..." option (though others may correct me).
What I think you could do is create another macro
Triggered: on wake
With an if.. then... else action:
If
USB device with "[name of device]" exists
then
[run your original macro].
Would that work for you?
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@KevinCoates That's a really great solution! I have a couple different devices to look for, so I made a few different If/Then statements in the macro. Seems to work so far, will test it out some more. Thanks! 