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How I Turned QR-Coded Chips Into a Multi-Track Musical Instrument on iOS Without Core ML

Hacker Noon

TechnologyHacker Noon·Sep 10, 2026·1 min read

How I Turned QR-Coded Chips Into a Multi-Track Musical Instrument on iOS Without Core ML

My phone is lying face-up on a flat board. The board has a small transparent window cut into it. I slide a plastic chip underneath the window. A drum loop starts playing. I slide another chip in. A bass line joins. I pull one out and the…

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