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

This story was originally published on HackerNoon at: https://hackernoon.com/how-i-turned-qr-coded-chips-into-a-multi-track-musical-instrument-on-ios-without-core-ml . How I built an iOS app that turns QR-coded chips into a 24-track musical instrument using AVFoundation, with no Core ML and zero dependencies. Check more stories related to programming at: https://hackernoon.com/c/programming . You can also check exclusive content about #ios-app-development , #open-source , #edtech , #systems-engineering , #computer-vision , #audio-processing , #software-architecture , #hackernoon-top-story , and more. This story was written by: @vitaliy69 . Learn more about this writer by checking @vitaliy69's about page, and for more stories, please visit hackernoon.com . MusicWaveBoard is an iOS app that turns physical QR-coded chips into a multi-track musical instrument. The front camera scans chips through a transparent board, a 24-track AVAudioEngine plays corresponding loops, and a time-windowed detection system keeps the music glitch-free. This build story covers the rotating-rectangle QR scanning workaround, gapless audio looping, a Thread.sleep fade hack, voice control with keyword matching, and what I'd do differently. It ends with where this mechanic is going next: an AI-generated audio engine where every chip gets its own model-created sound, and an early-stage venture in music education for children.