Useful Hints:
1. Instead of using the space-bar to indicate when the target is audible it is possible to use a
joystick button. Some joysticks are programmable - just set whichever button you want to use
to be the space-bar.
2. If you don't have a programmable joystick, it is possible to use freely available software
such as Joy2Key to reprogram a USB joystick/gamepad to do the same job.