Loudness Contour v5.3.1 WiN MAC

Team BTCR | 17 March 2026 | 180.46 MB

Real-time equal-loudness Contour Shaping

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.

Version 5.3.1:
– Fix tooltip not displaying for peak meter
– Additional minor performance improvements

Version 5.3.0:
– Fix units on visualization range (spectrum/contour/truegain)
– Core performance improvements
– Timing engine accuracy improvements
– Fix mouse hit detection with UI scaling enabled
– Improve popup look and feel within certain DAWs

INFO/DEMO/BUY: https://mage.si/contour
Loudness Contour v5.3.1 WiN MAC-BTCR
♪ Download ♪