APU Software TrueGain (Digital product)

APU TrueGain: Frequency-Compensated Gain Control

APU TrueGain is a gain control plug-in that adjusts volume and frequency balance together, using equal-loudness contours like ISO 226. The compensation accounts for how hearing sensitivity shifts at different listening levels. Adaptive SPL tracks the input signal and updates the EQ curve in real time. A built-in spectrum analyzer shows source, target, and output signals side by side.

What Sets TrueGain Apart

Unlike a standard volume knob, this plug-in applies frequency compensation using three contour models: ISO 226:2003, ISO 226:2023, and Fletcher-Munson. Translation Check mode previews how a mix sounds at another listening level without changing monitor volume. Mini mode keeps the main control visible in a compact window for quick tweaks mid-session.

Who Should Use APU TrueGain

APU TrueGain is the right choice for mixing and mastering engineers who want mixes to translate consistently across playback levels. It suits producers checking how a track holds up at quiet home listening versus loud club playback, without rebalancing monitors. Hobbyists exploring loudness perception will find the contour models and calibration workflow approachable.