This toggle was made available with the MK2's Firmware 3.0 update.
Roland has not explained this part of the update in detail, but I believe you may want to activate this if you are using more than a bank's worth of pads. Which is easily possible if you start messing around in pattern mode. I'm sure this machine has limits when it comes to playing back samples.
I avoid this type of situation entirely by only working with the resample and skip-back recording to make loops on each specific pad. Combine your SP404-MK2 with your DAW via the USB-C and you can record loops and patterns without using the built-in mode on the SP. It's cumbersome and not really worth the effort in my opinion.
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