FlexCurve is a VST3 headphone-correction curve editor, layer-based calibration tool, AutoEQ workspace, and FIR renderer. It imports local TXT, CSV, Equalizer APO / Wavelet GraphicEQ, APO Parametric EQ, Melda FreeForm EQ CSV, and WAV FIR files as editable layers, previews changes in real time, blends active layers into an Average curve, and renders the result as Minimum, Natural, or Linear phase FIR.

Features

  • Multi-layer headphone calibration workflow with editable EQ, Target, RAW and Average curves.
  • Import TXT, CSV, GraphicEQ, APO Parametric EQ, Melda CSV and WAV FIR files as editable layers.
  • AutoEQ matching from RAW measurements to Targets with Corrected Measurement tracking and comparison.
  • Graphic EQ, Variable EQ and Parametric EQ editing with curve blending and average rendering.
  • Minimum, Natural and Linear phase FIR generation and export at the current host sample rate.
  • Input/output metering, Auto Gain, Output Gain and loudness-matched A/B comparison tools.
  • Preset system with embedded curve data, rendering state and calibration workflow persistence.
  • Independent Left / Right channel correction state per layer.

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Categories

Audio Editing

License

Affero GNU Public License, GNU General Public License version 3.0 (GPLv3)

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Additional Project Details

Operating Systems

Linux, Mac, Windows

Intended Audience

Advanced End Users

Programming Language

C++

Related Categories

C++ Audio Editing Software

Registered

2026-06-12