Probably you have nothing on one of the channels that will make the average lower.
( I use a mixer so centre the signal for mono signals)
I guess I could change audio_in to be the left channel ( which is usually used for mono due to cables) - but that has the disadvantage that the triggers are solely based on left for stereo signals.
There’s really not enough options on the UI to make it switchable, at least at the moment - and for the time I have to do this.
I guess left=mono is the least painful option for now