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Traktorino is an open-source DIY MIDI controller for DJs | Arduino Blog
4 Things to Consider when Designing your own Hardware Music Controller
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This is casing designed for a "DIY keyboard" USB controller pcb and a 3x4 key mechanical keyboard. The controller can be bought at … | Keyboard, Key diy, Macro keys
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Build you own MIDI Keyboard Controller from Data Point Ltd on Tindie