Offline spectral matching

Tone Match Lab

Audio files stay local in your browser and are not uploaded by this app.
PCM and float WAV files are decoded internally into 64-bit floating-point arrays.
Non-WAV formats use the browser decoder, then are copied into the same 64-bit processing path.
Spectral analysis uses gated, windowed FFT frames to avoid letting silence and fades dominate the match.
Correction curves are smoothed, bounded, and rendered through a linear-phase FIR filter.
Rendered audio preserves the source sample rate and channel count whenever using internally decoded WAV files.
Optional output gain staging preserves source RMS and applies an estimated -1.0 dBFS true-peak ceiling.
Export supports 32-bit float WAV plus dithered 24-bit and 16-bit PCM WAV.
Transport level matching is monitor-only and does not alter analysis, rendering, or exported audio.

Ready

Tracks

Reference No file loaded Source No file loaded

Amount 100% Limit 12 dB Gate 48 dB

Smoothing FIR taps Low Hz High Hz

Preserve source RMS Ceiling at -1.0 dBFS

No render

Reference Source Rendered

0.0 dB max

0:00.0 0:00.0

Match Reference to Rendered Render first Level basis WAV