One volume, measured the way streaming does.
Two tracks with the same peaks can sound worlds apart, which is why matching volume by eye or by peak never quite works. LevelAudio measures how loud each track feels, in LUFS, and brings every track to the same number.
What LUFS is
LUFS (loudness units relative to full scale) measures felt loudness the way broadcasters and streaming platforms do: weighted towards the frequencies the ear is most sensitive to, averaged over the whole track, with silence left out. The method is ITU-R BS.1770-4, the basis of the EBU R128 standard.
One LU is one decibel. Tracks within about 1 LU of each other sound equally loud; a gap of 3 LU or more is easy to hear.
Which target to pick
Any other value can be typed in as a custom target.
No clipping, no squashing
Raising a quiet track can push its loudest split-second peaks past the limit. So every target comes with a true-peak ceiling: −1 dBTP by default, −2 for extra headroom, or off. A track that can't reach the target under the ceiling gets less gain, and the app marks it, instead of being compressed or limited.
Prefer every track as loud as it can go, without matching them? Switch the mode to “just boost to maximum”.
How close it lands
- The meter is tested with reference tones from EBU Tech 3341, which allow ±0.1 LU.
- WAV and FLAC land on the target, unless the ceiling holds them back.
- MP3, kept lossless, moves in 1.5 dB steps, so tracks land within ±0.75 dB of the target: inaudible in practice. “Re-encode for exact volume” hits it exactly, at a small cost in quality.
In the app, the bar beside each track shows its distance from the target: green within 1 LU, yellow up to 3 LU, red beyond.