Confusing Casio keyboard connections clarified

When recently asked to help make sense of an unintuitive keybed design (from a Casio CTK-510) – I quickly recalled my own frustrated attempts to repurpose a similar assembly. Though I never did fully ‘get’ the logic of that key matrix, I was really just surprised there were no example analysis to be found on the Google. Luckily, a couple years later, that status has changed after coming across Highly Liquid’s primer on basic keyboard matrices. Good stuff that’ll likely come in handy for hackers/benders/synth-DIYers out there.