Full Throttle

Gentlemen;I'm getting myself a little confused.I have an older TM FCSP joystick and TM rudder pedals. They are ancient I know....I've been trying to set up my keyboard throttle assignments and am getting a little confused over which FSX commands to use and what they mean. On the keyboards settings screen these commands are listed and my current key assignments.Event: KeyboardThrottle (cut) F1Throttle (decrease quickly)Throttle (decrease)Throttle (decrease) why the second one I don't know F2Throttle (full) F4Throttle (increase quickly)Throttle (increase) F3Throttle (increase) again a second one... why?Any insight into which ones I should be using would be greatly appreciated. Also if some could point out what the difference between the second & first "increase" and "decrease" would be of help.