The latest articles on DEV Community by Zubin Jiang (@sirenmix). https://dev.to/sirenmix https://media2.dev.to/dynamic/image/width=90,height=90,fit=cover,gravity=auto,format=auto/https:%2F%2Fdev-to-uploads.s3.us-east-2.amazonaws.com%2Fuploads%2Fuser%2Fprofile_image%2F3803529%2F664dde0c-2d0b-475b-a531-dff69bc20d7c.png https://dev.to/sirenmix en Zubin Jiang Tue, 03 Mar 2026 09:35:05 +0000 https://dev.to/sirenmix/building-sirenmix-music-cloud-storage-built-for-djs-3oi6 https://dev.to/sirenmix/building-sirenmix-music-cloud-storage-built-for-djs-3oi6 <p>SirenMix is a collection of privacy-first browser audio tools built for day-to-day DJ work. Each tool focuses on a practical task and runs directly in your browser.</p> <p><strong>Your audio files stay local: processing happens in the browser, and files are never uploaded.</strong></p> <h2> Tools for the DJ workflow </h2> <ul> <li> <strong>BPM Changer</strong> — Detect a track's BPM, change its tempo while preserving pitch, preview the result, and export when it sounds right.</li> <li> <strong>Audio Converter</strong> — Batch-convert MP3, WAV, FLAC, and OGG files for different players, libraries, and performance setups.</li> <li> <strong>Gain Adjuster</strong> — Inspect the waveform and peak level, adjust gain, and export safely without accidental clipping.</li> <li> <strong>Key Changer</strong> — Transpose a track in semitone steps while keeping its speed unchanged, with Camelot guidance for harmonic mixing.</li> <li> <strong>Spectrum Analyzer</strong> — Inspect a full-track spectrogram and cutoff frequency to help identify fake 320 kbps files and fake lossless audio.</li> <li> <strong>Camelot Wheel</strong> — Use a clear harmonic-mixing reference to find compatible keys quickly.</li> </ul> <p>You can open the full toolkit at <strong><a href="https://sirenmix.com/tools" rel="noopener noreferrer">sirenmix.com/tools</a></strong>.</p> <h2> Tech stack </h2> <p>SirenMix is built with <strong>SvelteKit 5</strong>, <strong>TypeScript</strong>, <strong>LibAV.js/WebAssembly</strong>, and <strong>Paraglide</strong>. The browser-based architecture keeps audio processing close to the user while providing a fast, focused interface for each task.</p> <p>If you DJ with a browser in your preparation workflow, try the tools and let me know what would make them more useful.</p> webdev showdev javascript svelte