Playing with 2 guitars

Hi,
I m trions to play with 2 guitars , one of them have the same preset and the other move,
When I’m switching preset there is a little blank between both for the constant preset;(
Someone can help me ?

The gap when switching presets is normal and can not be avoided. To switch without a gap use Scene Mode.
For more information see: Preset bleed/Gapless Switching between Presets

And have a look into the user manual as well, there everything about switching is described very well.