okay, another question that might already have been answered elsewhere ... The diodes are directional, of course. So, does that make assumptions about where the Teensy / et al. are? And, what about serial expanders ... as much for the experience as for using an already-bought item, I was hoping to use an 18-pin board, I would need 20 to go in straight lines without creative wiring (which I haven't ruled out) but reading Soarer's documentation, I guess the exander has to drive what it's attached too, which would be the columns ...
So, do I want the uController to the left of the control key, or the right of the enter key? Or alternately, below the space, or above the numbers (assuming a moderately conventional layout for those mental images)?