As a former UI-24 user, I would also like to perform a virtual sound check on the CQ-20 with one button. Currently, this is only possible if I switch the source from recording to playback for each individual channel. This is very time-consuming and very prone to errors in live operation, e.g. if you forget to switch a channel. Do you have any experience or a proven workflow for doing a virtual sound check with just one click? Thanks for any suggestion.