I have this driver
http://cgi.ebay.com/ws/eBayISAPI.dll...m=260509188593

And it has connector for manual control.
Can someone please explain me what PINs do I need to connect to move steppers, and on what PIN's can I connect LEDs so I can see them lightning when stepper moves.
This is the pinout of connector:
P1- X STEP
P2- X EMPOWE
P3- SPIND
P4- X DIR
P5- Y EMPOWE
P6- Z DIR
P7- Z STEP
P8- Z EMPOWE
P9- Y LIMIT
P10- Z LIMIT
P11- Y DIR
P12- Y STEP
P13- STOP
P14- GND
P15- 5V/VDD

Also, I can change "Buffer Settings" with jumpers on board.
Can someone please explain me what this means?
I can chose this settings :Fast, 25% , 50% , Slow

Thanks!