A single button toggle for virtual sound check that automatically and dynamically toggles needed channel inputs to sd card based on the channels recorded in multitrack recordings. Alternatively, this button could just change all inputs to sd/usb input and back at once if this implementation is simpler.
It would be really perfect, it would be much quicker to do the sound check!!!
I also asked for the same thing together with the possibility of being able to choose for each channel in the pre and post master Aux outputs
+1 a function to change all input sources simultaneously for a virtual sound check
or an input matrix for analog and digital inputs same time on one channel