Experimenting goes further:

– Basically my momentary NO switch works on the options I tried: Bypass, Program+, Program-, Tuner. It doesn't seem to work on TAP. 

I also found another option called FS1? What's this for. If I set this up to connect to RING my aux switch sets both Bypass On/Off and tap tempo? It looks like there's something not correct here? 

I also connected the aux switch to PSW and on the Street preset it shows "Repeat On" in the display and it again makes tap tempo work in parallel.

From one side I'm basically beta testing your product, from the other side this is taking me a lot of time with options that should just work. I would really appreciate it if you could look into this to see what's causing these issues? 

Should I perform a factory reset to see if that does anything?