NVFlash...how do change the straps ?

[302efi]

I'm trying to change the number of straps (pipes) in my video bios . I can get to it in DOS but I cant figure out the code..heres the command line:

nvflash --straps <number>

then it says this about the number:
AND Mask 0 OR Mask 0 AND Mask 1 OR Mask 1