My first little tool, mainly due to the change of the R3 GUI.
Keybinding is Pattern/mixer toggle.
What does it do? Have one keyboard shortcut to switch between the two tabs? Switching between two snapshots too hard (F1 or F2)? 
edit:
Congratulations on your first script 
Yep When theres only 2 tabs in that view 1 key will do.
Yay! 