SpecterBeats

Where motion becomes music.

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Inspiration

DJing should be universal. In many underdeveloped countries, people simply do not have access to full DJ setups. Hardware is expensive, bulky, and extremely difficult to obtain. Even when the passion is there, the tools are not.

I wanted to build something that removes that barrier completely. Something that lets anyone, anywhere, on any device, practice, experiment, and perform for free. Specter Beats grew out of that idea: a way to make DJing accessible even without professional equipment.

What it does

Specter Beats is a browser based DJing experience that turns any phone, tablet, or computer into a functioning DJ deck. Users can load tracks, mix, scratch, manipulate audio, and practice real techniques without needing hardware.

It is designed to feel close to a real deck while living entirely online. This gives people in underserved communities, and anyone just starting out, a chance to learn and create without cost or equipment.

How we built it

The interface is built in React with a clean, responsive layout using TailwindCSS so it works well on all screen sizes.

The mixing logic uses OpenCV to process track waveforms and visual effects. Python is used for backend audio experiments and effect prototyping.

Everything is modular and focused on running inside the browser so users do not need powerful hardware.

Challenges we ran into

  • Getting accurate gesture detection with OpenCV required a lot of tuning, especially since lighting, skin tones, and motion distance all affect tracking quality.
  • Connecting real-time camera data to audio filters and effects was harder than expected. Ensuring low latency while keeping everything browser-based took several iterations.
  • Balancing simplicity with creativity was a real challenge. The app had to feel fun for casual users but still powerful enough to actually mix tracks and manipulate effects.
  • Managing React state for continuous real-time camera input, UI animations, and audio processing all at once was more complex than expected.
  • Designing a UI that felt clean, spooky, and accessible across devices took multiple redesigns. Getting responsiveness right on phones, laptops, and tablets required extra refinement.

Accomplishments that I'm proud of

  • The gesture-controlled mixing worked earlier than expected and continued to function even as more effects and UI elements were added.
  • A smooth, lightweight React interface with TailwindCSS that feels polished and modern while still fitting the Halloween theme.
  • A camera interaction system powered by OpenCV that reliably turns hand movement into audio changes without external hardware.
  • A web experience that runs on almost any device, even low-end hardware, which supports the goal of making DJing accessible for everyone.

What I learned

  • Kiro was extremely helpful throughout the development process. Even with experience in React and Python, Kiro helped turn prototypes into a clean, functional system much faster than I could have done alone.
  • The OpenCV pipeline I started with was too messy. In hindsight, I should have let Kiro help rebuild the gesture detection system from scratch. It would have saved time and reduced technical debt.
  • Feedback from early testers mattered a lot. People with no DJ experience still wanted to play with effects, and that helped shape the simplified control layout.
  • Planning for performance early on is important, especially for real-time applications. Optimizing the camera feed and audio engine early prevented bigger issues later.

What's next for Specter Beats

  • Expanding gesture capabilities so users can control more effects like reverb, speed, loops, or cue points.
  • Building a library of themed sound packs so users can blend Halloween effects with their music.
  • Adding a collaborative mode where two people can mix together using separate devices.
  • Exploring a mobile app version that uses native camera APIs for even faster gesture detection.
  • Improving the visual effects system, including more animated backgrounds and reactive UI elements.
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