The Quiet Room - Guide Track Render Diagnostic Summary

30 Jul 2026

The Quiet Room - Guide Track Render Diagnostic Summary

Received: 2026-07-30 10:59 GMT+1 via Telegram from John Source: External thread context document covering Songs 1-6 + guide track v1/v2 diagnostics Track: The Quiet Room v6g · 65 BPM · A minor Files saved:

Core Diagnosis: AUDITORY FUSION, not masking

Dakota's root-cause hypothesis ("MuseScore piano patch masks everything") is wrong. Refuted three ways:

1. Differential audibility: bass +21.9 to +29.6 dB, strings +7.3 to +19.0 dB, harmonics +6.5 dB - all plainly present 2. Choruses are STRING-dominated: 57-60% of chorus energy sits in 420-700 Hz (strings' register). Piano fundamentals are 175-440 Hz 3. Section arc EXISTS: verse -31.6 dB → chorus -22.4 dB = +9.2 dB lift, 17.5 dB range, LRA 14.2 LU

Why it sounds like one instrument:

All four source-separation cues are defeated simultaneously:

Five Concrete Bugs

1. Outro never rendered: duration_beats:144 but form ends at beat 152 2. No chorus escalation: C1 -22.54, C2 -22.33, FC -22.35 = 0.21 dB spread. Strings+harmonics pinned at velocity 127 3. -24.1 LUFS = ~10 dB too quiet for upload 4. Pad inaudible: A3=220Hz in UNISON with piano A3. Duplicate pitches in chords [A3,E3,A3] and [F3,C3,F3] 5. Harmonics: E6 +2.4 dB and C6 +2.9 dB below detectability; only A6 clears

JSON Annotations vs Reality

The pre-render gate validates annotations, not the music. Multiple annotations are false:

Sustain Problem (unresolved)

Nothing sustains. All notes decay -33 to -40 dB by 1.2s. Either:

Need the .mid file or five single-channel renders to settle it.

Ranked Fixes

1. Stagger onsets - add `onset_offset_ms` per part so instruments don't all hit simultaneously 2. Spread pan - 18-110 range, not 45-64 cluster 3. Differentiate envelopes - vary attack/sustain/release per instrument 4. Stop using velocity 127 - strings and harmonics pinned at 127 leaves no headroom 5. Restore piano - ~52/72/40/84 range, not 25-35 6. Compute duration_beats correctly - 152 not 144 7. Gain +9dB post-render - target -14 to -15 LUFS 8. Fix pad voicing - [E3,A3,C4] not [A3,E3,A3] (avoids unison with piano) 9. Make Bridge caesura real - actually silence other parts 10. JSON format overhaul - add `onset_offset_ms`, `reverb_send`, `attack`, `target_lufs`

Cross-Song Context

This is song 6 in an iterative analysis thread training Dakota as a local AI composer writing dark folk for Suno. Key persistent failures across all songs:

Three-song trend (Version A):

Guide v2 key conclusion:

Suno faithfully reproduces a signal whose acoustic signature IS background humming. 13 metrics at 1.9x to 206x deficit vs a real lead vocal. Top recommendation from analysis: sing/hum the guide into a phone. Fixes all 16 metrics at once.

Action Items

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