Thanks for your answer. Personnaly I don't mind loosing In/Out levels and Tap Tempo feature for this mode. The tuner is a bit more boring but I can live with. I have no time to tune during a chorus . But often I need quick preset change without tap dancing that disturb me in my playing. If needed I can eventually press button(s) by hand between to songs to retune…

As a side question what about an indicator (let say X and Z leds that I think are unused in the "preset change mode") in the current mode to tell in which way presets will change? That would avoid some mistakes on stage.