Never Messed with the default tags before...
You'll probably be better off if you just make the animation shifts with custom conditions
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object coliding with platform/solid at offset +10.y(or whatever):
--->no key down
speed=0: Set animation to standing
--->speed>0: for runing
--->key down"down arrow": set animation to crouch
jump animation finish: set animation to fall
press space: set animation to jump
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if the animations get stuck, just add a trigger once condition.
---> just means subevent