APU Software releases Loudness Contour Plugin and updates Loudness Series to v3.7.6

APU Software has announced the release of APU Loudness Contour, an equal-loudness contour plugin-in and standalone application supporting ISO 226, Fletcher-Munson, K-weighting (LUFS), ECMA 418, ITU-R 468, A-weighting and C-weighting loudness contours, and updated APU Loudness Meter, APU Loudness Compressor, APU Dynamics Optimizer, and APU Loudness Limiter to version 3.7.6. APU Loudness Contour APU Loudness Contour is a real-time equal-loudness filter that offers precise control over a wide range of perceptual loudness contours, including ISO 226 (2003 & 2023), Fletcher-Munson, K-weighting, A/C-weighting, ECMA-418, and ITU-R 468. Each contour is normalized to 0 dB at 1 kHz and includes a dedicated contour weight parameter, allowing you to scale the frequency response in both positive and negative directions. A weight of 0% results in a flat response, while negative weights invert the contour. ISO 226 and Fletcher-Munson curves support variable reference levels from 20 dB SPL to 120 dB SPL, with smooth interpolation between phon curves. The plugin supports both linear phase and minimum phase filter types. Built-in makeup gain compensation is provided per contour and reference level, calibrated using pink noise LUFS measurements. When enabled, makeup gain offsets the entire contour response by the corresponding gain amount. Additional output gain is available for manual fine-tuning. A comprehensive real-time spectrum analyzer is included, featuring configurable FFT sizes, window types, bucket widths, and time averaging. Frequency visualization can be switched between linear, logarithmic, or musical note scales, with auto-zoom and custom dB range options. YouTube.com/watch?v=qCHEZrBuGM8 Pricing & Availability APU Loudness Contour is available for macOS and Windows in VST3, AU and AAX plugin formats for the introductory price of $30. A trial version is available. APU Loudness Series v3.7.6 Changes: Switch default theme to APU Default. Fix occasional spectrum analyzer glitches (contour). Fix stutter on bypass toggle (contour). Improve auto range label visibility. Initial release (contour). Tweak limiter icons for clarity (limiter). Minor fixes. Fix axis tick count in certain situations. Better uniform random number generation for dithered ballistics. Double the number of color themes. Smooth axis zooming. Fix LUFS limiter ceiling offset in certain cases (limiter). Fix latency-dependent preset parameters not loading in certain situations. Improved axis and text bubble overlay. UI Scaling option in Settings tab. The update is free for registered owners. Read More