Hi Richard,   you mentioned your project earlier, I would be very much interested in details.   Again, I am using reed switches which to me have proven superior in several respects over electrical contacts. Also I am glad I decided for a matrix keyboard which drastically reduces the amount of wires (yet in turn requires that you address the issue of ghosting).   fwiw, I attach two images of the current state of progress ( I have resurrected the project recently). I
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