Aye,
just discovered the following:
If I have a longer Delaytail and switch to Tuner (Muted) then the delaytail would be still hearable (so far so good).
I´ve got ducking on delay. And when I strumm in Tuner Mode with still parts of the delaytail in the background, the delay is muted (but without the muted sound).
Funny. Fail or feature?
If fail, then deactivate all duckings while in Tuner Mode so the Tails can wear of untouched.