state = JoyAxisY(port[, idx])
port. The y axis state is returned in the range of
-1000 to 1000. The optional argument idx can be used to specify the
index of the joystick to use in case there are multiple joysticks on
a controller. Joystick indices start at 0.
port can range from 0 to the number of joysticks currently plugged in
minus 1. You can find out the number of joysticks currently available
using the CountJoysticks() function. Please note
that under AmigaOS, port 0 addresses the standard joystick port although
this is port 1 on classic Amiga hardware. Hollywood switches these ports
for cross-platform consistency where port 0 shall always refer to the
default joystick.