https://www.scirra.com/manual/143/gamepad
at gamepad expressions , its said :
gamepad.Axis(gamepad,index) ??? but no example of expression usage. I can't find how to use thoses values properly.
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[...]Index specifies left analog X and Y or right analog X and Y axes[...] 0-based
gamepad : 0-based gamepad index (eg gamepad1 = 0)
gamepad.Axis(0,0) returns axis value for the left joy of 1st gamepad