I've seen nothing on this subject. I would like to know as well. This is a MAJOR consideration for me.
The XL supports X/Y for the Compressor, Gate, Graphic EQ, Parametric EQ, Tremolo and Mixer blocks.
I have a Mark 1 and have no plans to upgrade, till say the Axe Fx III.I was weighing the two models but made me decide to go with the XL.
Double-capacity preset size allows for expanded functionality including X/Y switching on more blocks and more instances of effects.
But yeah if I was to buy today I would go with the XL.
What does the emphasized part mean?
Maybe instead of two blocks of a given effect being available, there are now four... again because the memory will allow these settings to be stored. This doesn't mean that the CPU will be able to process more. But it could give more flexibility with preset design.