Output meter

> The right-hand sidebar is a full mastering meter: sample-peak, true-peak, LUFS, stereo correlation, gain-reduction readout, L/R/M/S monitor iso buttons, and switchable reference scales for K-12 / K-

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The right-hand sidebar is a full mastering meter: sample-peak, true-peak, LUFS, stereo correlation, gain-reduction readout, L/R/M/S monitor iso buttons, and switchable reference scales for K-12 / K-14 / K-20 mastering work.

Output meter sidebar

What it measures

The output meter sits after the Equal-Loud Bypass, Output Trim, and dither stages — that is, exactly what your DAW will receive — but before the optional Monitor Iso, so the bars always show the unaltered programme even while you're soloing a side for inspection.

Sample peak

Per-channel |x| with exponential decay (30 dB/sec by default). Quick visual check of instantaneous level.

True peak

4× polyphase oversampled |y|, Kaiser-windowed sinc, 12 taps per phase (48 total). ITU-R BS.1770 compliant within ±0.05 dB on full-band sines.

The TP digit at the top of the sidebar shows the current peak; keep it under −1.0 dBTP for any streaming master.

LUFS

Integrated LUFS reading with a separate window for momentary, short-term, and integrated values. The LUFS Target picker chooses how the integrated value is interpreted:

Custom — back-end RMS-target Auto-Headroom (legacy behaviour).
Spotify — target −14 LUFS-I.
Apple Music — target −16 LUFS-I.
YouTube — target −14 LUFS-I.
Vinyl — target −12 LUFS-I.
CD — target −9 LUFS-I.
Club — target −7 LUFS-I.
EBU R128 — target −23 LUFS-I.
ATSC A/85 — target −24 LUFS-I.

Pick the platform you're delivering for and the meter shows you whether you're under, at, or over the target.

Stereo correlation

400 ms single-pole Pearson accumulator across L and R. The readout is between −1 and +1:

+1 — perfectly correlated (mono).
0 — uncorrelated (typical stereo program).
−1 — perfectly anti-correlated (out-of-phase; problem material).

Mono buffers always report +1.0.

Gain reduction

When Equal Loud Bypass is active, the meter shows the current makeup-gain value being applied to match bypass loudness. Useful for understanding how much your processing is changing the loudness before the matcher kicks in.

L / R / M / S iso buttons

Bottom of the sidebar. Click any to solo just that monitor source. Off is passthrough. The iso transformation sits after the meter, so the bars always show the un-iso'd material.

K-meter reference scales

The Meter Scale picker (top of the sidebar) chooses the reference scale:

Off (default) — dBFS, the standard digital scale.
K-12 — Bob Katz's K-12 reference. 0 dB on the scale = −12 dBFS. For contemporary mastering with peaks around −1 dBTP.
K-14 — K-14 reference. 0 dB = −14 dBFS. For broadcast and quieter mastering.
K-20 — K-20 reference. 0 dB = −20 dBFS. For film, classical, and dynamic mixes.

The K-scales recolour the meter bars to flag the comfortable zone for each style.

Input meter sidebar Mirror layout on the left side: pre-EQ tap, L/R balance readout (instead of GR), and the optional Input Gain / Clip stage. Use the input meter to check your incoming signal before any processing.

Tips

For a Spotify master, set the LUFS Target to Spotify and aim for the integrated value to read at −14 LUFS-I or quieter, with True Peak under −1.0 dBTP.
The K-meter scales aren't a different measurement — they're just a different colour-coded view of dBFS. Switching scales doesn't change the meter math.
Use Monitor Iso for inspection only; remember to switch it back to Off before bouncing or your bounce will be filtered.