Emu XL-7 & MP-7 User's Group

I've only been producing and using the Emu a few months.  I've been reading manuals and everything on the internet I can find. I am starting to understand Hex & have figure out NRPNs and CC.  BUT some SysEx is alien to me.  The Emu manual has things like KK VV XX YY ZZ  NN but  hex is 0 to H. The sysex info seems to have different meanings for different commands for the letters.

8n kk vv is the command for note off.

n = midi number
kk = ?
vv = ?

Is this so standard that all companies shouldn't have to define it and I'm missing some chart on it?

Is 8n kk vv all I enter or do I need more numbers for machine ID, EMU id, on, off, etc?

Most of the tutorial sites treat you like a computer programer not a layman.