Need Help with scripting multiple poses to a boat script

[Miguelito Shilova]

I am working on a foilboard (it's like a surfboard) and using a basic boat script, found here ...

What I am having difficulty with is figuring out how to trigger multiple poses when the user is operating the foilboard. There is a default 'crouching' pose and three others. I have been trying to call the poses during the control event, so that when a user presses the FWD, CONTROL_LEFT or CONTROL_RIGHT, a corresponding pose is applied to the user. What I'm looking to have happen is that when the user selects 'Ride' the crouching pose is applied. When driving forward, the avi is shown standing, as well as leaning left when going left, and leaning right when going right. When no control input is given, the avi is returned to the crouching pose. I have the custom poses, but I just need help sorting out the script. 

Not sure if it's possible, but would also like to be able to adjust the SitTarget for each pose, instead of them all using the same SitTarget. 

Please let me know if you are interested in helping. Thanks!

Mig