Occasional notes from Audiofile Engineering on building audio software: Mac and iPhone apps, audio engines, plugin hosting, and shipping on Apple platforms.https://audiofile.engineering/enhttps://audiofile.engineering/notes/blank-preset-still-a-button/https://audiofile.engineering/notes/blank-preset-still-a-button/Software has no mass, no detents, and no manufacturing tolerance — which is exactly why it has to be built like it does. On timing as a material, skeuomorphism as a constraint rather than a decoration, and what building companion apps for hardware taught us about both.Mon, 17 Aug 2026 00:00:00 GMThttps://audiofile.engineering/notes/hardware-easy-part/https://audiofile.engineering/notes/hardware-easy-part/From concept to contract manufacturer, we built the hardware behind turning an iPad into a second monitor for your Mac. The firmware — the software that keeps a device's promises — is where the schedule, the reviews, and the trust actually live.Tue, 21 Jul 2026 00:00:00 GMThttps://audiofile.engineering/notes/one-star-reviews/https://audiofile.engineering/notes/one-star-reviews/How years of 1-star reviews — ours and every player in the category — became the roadmap for rebuilding a fifteen-year-old audio app, and why the promises that matter are the boring ones.Thu, 16 Jul 2026 00:00:00 GMThttps://audiofile.engineering/notes/five-crash-logs/https://audiofile.engineering/notes/five-crash-logs/A customer's plugin crashed our player on every editor open. Same plugin, same app, zero crashes on my machine. A forensic walk from MetricKit JSON to a one-line fix — and the discipline that matters more than the fix.Wed, 08 Jul 2026 00:00:00 GMThttps://audiofile.engineering/notes/rebuilding-fidelia/https://audiofile.engineering/notes/rebuilding-fidelia/One engineer, a fleet of coding agents, and a music player rebuilt for modern macOS: sandboxed Audio Unit hosting, deterministic replay harnesses, and the rules that made it work.Wed, 17 Jun 2026 00:00:00 GMT