Tap Tempo aux switch issue/question

 Could you explain or enlarge on this part- "but the old Boss FS-5U and both do the same thing: they read "Ring" then "T+R" in the aux switch settings."

How have you wired up your switch ? Should be pretty easy – just need to connect from either tip or ring to sleeve to activate. Don't try a T+R unless you are sure you know what you are doing.

 Good !!

A point worth adding to our knowledge base is that one should use a stereo (TRS) jack into the AUX input. If one uses a mono (tip and sleeve only) jack, the unit will view it as a TRS jack with ring and sleeve connected. If then a switch is connected between T and S, it will be viewed as making T+R, which may be unexpected.