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realtimeconfigquickscan
Discontinued Linux configuration checker for systems to be used for real-time audio
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InfluxDB
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umc-404hd-signal-path
Signal path diagram for the Behringer UMC-404HD audio interface in .dia and .pdf format.
PREEMPT _RT or something like https://pipewire.org/ ?
I used this tool to identify stuff to tweak https://github.com/raboof/realtimeconfigquickscan and I did everything that was suggested.
With respect to direct monitoring, you may find this signal path diagram helpful: https://github.com/mcnster/umc-404hd-signal-path/raw/master/umc404hd.pdf . In particular it shows that with the MIX knob turned counterclockwise to the IN position, the inputs are routed to the main output and also, if the a/b monitor switch is elevated, to the headphones, but not to the other outputs.