Sebastian Krüger db01209f77 feat: implement professional logarithmic dB scale for level meters ...

Converted level meters from linear to logarithmic (dB) scale to
match professional audio software behavior and human hearing.

The Problem:
- Linear scale (0-100%) doesn't match perceived loudness
- Doesn't match professional DAW meter behavior
- Half-volume audio appears at 50% but sounds much quieter
- No industry-standard dB reference

The Solution:
- Convert linear amplitude to dB: 20 * log10(linear)
- Normalize -60dB to 0dB range to 0-100% display
- Matches professional audio metering standards

dB Scale Mapping:
  0 dB (linear 1.0)    = 100% (full scale, clipping)
 -6 dB (linear ~0.5)   = 90%  (loud)
-12 dB (linear ~0.25)  = 80%  (normal)
-20 dB (linear ~0.1)   = 67%  (moderate)
-40 dB (linear ~0.01)  = 33%  (quiet)
-60 dB (linear ~0.001) = 0%   (silence threshold)

Implementation:
- Added linearToDbScale() function to both hooks
- useMultiTrackPlayer: playback level monitoring
- useRecording: input level monitoring
- Formula: (dB - minDb) / (maxDb - minDb)
- Range: -60dB (min) to 0dB (max)

Benefits:
✅ Professional audio metering standards
✅ Matches human perception of loudness
✅ Consistent with DAWs (Pro Tools, Logic, Ableton)
✅ Better visual feedback for mixing/mastering
✅ More responsive in useful range (-20dB to 0dB)

Now properly mastered tracks will show levels in the
90-100% range, matching what you'd see in professional software.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

2025-11-18 15:23:33 +01:00

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