General turbo, analog stick command - what is it?

Hello all.

I am considering making my own stick for SF4 on my PS3. I’ve looked at most of the sticks on the market. Most have either 6 or 8 player buttons (30mm Sanwa), and 3 admin buttons (24mm Sanwa). I assume the admin buttons are for Select, Start, and for xbox360 the ‘X’ button.

Is that about right?

I’m also confused when I see some sticks including a ‘General turbo, analog stick command’ - what exactly is this and is it needed for fighting games like SF4 and soon to be released Tekken?