[note: the wires running from the breadboard to the PCB are not routed properly, an FYI if anyone tries to use this picture for reference.]
So I've been able to play around with the parts that I've received so far but have hit a bit of a snag. I was able to get some of the code featured on Basement LEDs post up and running to test button presses. One of the problems I ran into, though was that it would correctly identify the column of a button press but then it would think that it was being pressed across all rows. I've checked the connections on my breadboard and think that everything is wired up properly, so I suspect it might be the code itself. Anyway, this is just a test rig and I'll hopefully be able to move forward soon.My real holdup is that I need a better pair of cutters before I solder the diodes and LEDs onto the Sparkfun boards. Right now I have an old pair of diagonal cutters that leaves a fairly long lead. Aside from being a neat freak with my connections, I've seen that I'll need to get the diode leads as short as possible to make sure the button pads don't ride too high. I've got some shear cutters ordered from Amazon that will, hopefully, arrive before I leave for vacation this week. Other than that I've got the breakout board mostly soldered and will try to get as much as I can together before I leave.
One of the other ideas I've had as far as customizations go is utilizing the analog inputs for extra controls. I'm kind of looking at it from an Ableton Live-centric point of view right now. I'm going to look into the possibility of adding a couple of pots to control things like global tempo, quantization, mixing channel, etc. I think I'll be able to use this post on the monome site regarding adding an accelerometer as a basis for moving forward on the add ons. The only thing I'm really not sure about at this point is whether I want to include any kind of additional functionality in a single enclosure or make a separate module.

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