> Really? I'd have thought an 8x8 square with no external parts. Drive the
> rows with portD and read the columns with portB interrupt on change. I'm
> not familiar with MIDI, but certainly I'd have thought the other 17 IO
> lines would be enough to implement it.
>
> As others are fond of saying "engineering is the art of compromise"

For midi ouput I think I need only one data pin, maybe an extra for
control so that's no biggy. But can I take stock 4x4 keypads and wire
them up 8x8? Problem is, I've never actually wired up a keypad. So while
I want it to be efficient, I'd rather use a less confusing set up then
anything else. Pin efficiency aside, what would be the most beginner
friendly?

Thanks
Iain

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