Misleading typo in the README

This line in the typo explaining general usage seems to be incorrect:

> In all cases below, the range for t (track number) is 1 through 4096, the range for out (output number) is 1 through 4 for the stereo firmware, and 1 through 8 for the mono firmware

I'm ashamed to admit that it took me way too long to realize that outs are zero-indexed :)