Since the "Monitor external input" settings for a mixer insert (On / When armed / Off) are irrelevant when the insert is set to anything other than "External input only", these options should be greyed out with "On" permanently selected if anything other than "External input only" is selected. This will avoid user confusion.
Alternatively, grey out only the "Off" option and change the mixer to mute the external input when not armed for recording if "When armed" is selected. This enables the options to be useful in more cases.
See viewtopic.php?t=301208
Minor UI improvement for recording monitoring
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