If you use several instruments on the QC, it can be very annoying to change the input of the tuner. I regularly have 4 instruments plugged into the inputs 1&2 as well as returns 1&2.
You can have the tuner set to listen to input 1 and 2 and to mute them at the same time. But return 1 and 2 can only be selected individually.
I request a feature where the tuner can be active on all inputs at the same time, namely on input 1, Input 2, return 1 and return 2.