I bought mine for occasional effects rather than the mainstay controller of all sounds and amp modelling.
One thing I did notice was that the thru sound (all switches off) drops in level, but I use it via loop switcher anyway, thereby bypassing (haha!) the issue.
(And yes, I did look at its level adjustments and so-on.)
That said, I do need to put some time into my pedal setup, as it's not come out of its case since the Bass Bash!