All possible audioracks are accounted for with what’s already there. In the I/O tab dSnake is whatever’s plugged into the dSnake port, up to 24/12, dSnake EXP is whatever’s plugged into the expander port of whatever’s plugged into the DSnake port, up to 16/8. It shows the maximum I/O that could exist, you just use as much of that as you have.
If you’re plugging an AR168 into the dSnake port just use the first 16 in and 8 out on the dSnake tab.
Chris