UNMATCHED__Portal2-02-Concentration_Enhancing_Menu_Initialiser.md

music/exemplars/formula_cards/UNMATCHED__Portal2-02-Concentration_Enhancing_Menu_Initialiser.md

Formula card UNMATCHED__Portal2-02-Concentration_Enhancing_Menu_Initialiser — (unmatched)

Game: n/a · Composer: n/a · Purpose class: n/a

Tier: RUNG-1 MEASURED · measured 2026-08-06T22:41:22+00:00 · source format mp3 at 44100 Hz

Length 136.673 s across 13 sections; baseline 184.57 bpm; key F minor.
Opens ostinato_first; the hook lands at 0.255 s.
Arrangement runs up to 9 spectral lanes; melodic salience 0.7809 across 263 extracted notes.
Event grammar: 3 drops, 5 raises, 1 breaks, 19 tutti passages; silence budget 1.6%.
Dynamic range 10.21 dB, peak at 0% through the track.
Complexity steps 2 times across 105 bars, 0 of them at a section boundary.

Lanes are a spectral_band_proxy reading, not an instrument roster. Section 11.1 requires the lane method be declared. Bands are not instruments: two instruments in one octave read as one lane, and one instrument spanning two octaves reads as two. Entry/exit and simultaneity shapes are trustworthy; a roster is not claimed.
Bar arithmetic on this card uses 4 beats per bar at the baseline tempo. The onset period beside it is MEASURED; the signature is not.
A cadence census needs harmonic transcription and is a rung-2 dimension; the seam measurement is what rung 1 can honestly report about how it ends.
Windowed key agreement below ~0.7 is the modulation signal at rung 1; a pivot-chord map needs symbolic transcription (rung 2).

Source file: D:\audio\exemplars\Portal2-OST\Portal2-02-Concentration_Enhancing_Menu_Initialiser.mp3
SHA256: e7ff519b0db759666e2fd3a6e8a63ef9ed83e5a7d4fa3abd6b1a35210edaf04b
Decoded by: ffmpeg.exe :: ffmpeg version 9.0-full_build-www.gyan.dev Copyright (c) 2000-2026 the FFmpeg developers
Legal posture: ANALYSIS FOR UNDERSTANDING ONLY. Audio lawfully obtained by Josh, read from disk, measured, and never copied, redistributed, or used as model input of any kind.

Generated by harness/site/structure_site.py — the URL path is the repo path. review root