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An experimental 5-"key" keyboard for homemade synthesizer. Intended for use with magnetic induction reed switches, Hall Effect sensors, or other simple buttons and switches. Five channels can operate independently or fed by a common input and mixed toward a common output. In "mixdown" mode, you can use extra spaces/pads for resistors, diodes, etc. A large number of unconnected pads for other customizations. Part of my ongoing audio device experimentation (https://www.diysynthjunk.dev/).