AudioEngineerKit: SPL & RTA

New: Feedback tab — spots acoustic feedback (howling) live and tells you the frequency and the GEQ band to cut. Reference only: it can mistake part of the music for feedback, or miss real feedback. Monitoring and alerts are free, and the first 3 detections of each session also show the frequency (from the 4th on, the frequency is Pro). Sound check (Pro): before the show, raise the gain slowly, collect the frequencies that ring, and save the list by venue or share it (for reference only). Keeps listening with the screen off and alerts you with a silent Time Sensitive notification, which can come through Focus and show on your Apple Watch. Turn it off any time: Stop in the app, or Stop on the notification. On Mac, closing the window stops measuring unless Background measurement is on or feedback monitoring is running — then a menu bar icon gives you Stop Measuring and Open Window. Fixed a crash that could happen when starting the RTA right after plugging headphones in or out, or right after using the Generator. Background measurement (optional, off by default): keep measuring while the screen is off. If a call or other interruption cuts it off, the app tries to resume automatically and lets you know if it can't. Noise-limit comparison: compares your 1-minute equivalent level and max level against the Korean inter-floor noise standard and the WHO night noise guideline — for reference only. PDF/CSV reports now include a period-by-period summary. More accurate metering — numbers may look different: dB is now calculated from actual sound energy instead of the old band-average method, so readings are accurate regardless of frequency (pink noise now looks flat on the RTA). The same sound may read differently than before. Your saved calibration has been reset — if you had matched it to another meter, please recalibrate. Older sessions are labeled with the previous metering method. Pro: threshold alerts now also arrive during background measurement (silent while the screen is off). Now also available in German, Brazilian Portuguese and French.