Older versions of SHKB were dependent on a hacked keyboard logic circuit.  For this rebuild I moved to an Arduino Leonardo.  Programming behaviors from scratch gave me much more control.  What’s more, the Leonardo is automatically identified by the computer as a keyboard, and there are plenty of related libraries to get you started.  With this build I also moved to actual heavy duty switches as opposed to embedding strips of copper in my silicone casts.  We’ll see how long they last…