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renato97 014e636889 feat: professional reggaeton production engine — 7 SDD changes, 302 tests

- section-energy: track activity matrix + volume/velocity multipliers per section
- smart-chords: ChordEngine with voice leading, inversions, 4 emotion modes
- hook-melody: melody engine with hook/stabs/smooth styles, call-and-response
- mix-calibration: Calibrator module (LUFS volumes, HPF/LPF, stereo, sends, master)
- transitions-fx: FX track with risers/impacts/sweeps at section boundaries
- sidechain: MIDI CC11 bass ducking on kick hits via DrumLoopAnalyzer
- presets-pack: role-aware plugin presets (Serum/Decapitator/Omnisphere per role)

Full SDD pipeline (propose→spec→design→tasks→apply→verify) for all 7 changes.
302/302 tests passing.

2026-05-03 23:54:29 -03:00

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Transition FX Specification

Purpose

Glue sections together by placing audio FX clips at arrangement boundaries using existing role="fx" library samples.

Requirements

Requirement: FX Track Existence

The system MUST create a dedicated "Transition FX" audio track with clips at 7 section boundaries.

Scenario: FX track present in arrangement

GIVEN a 9-section song
WHEN compose.py runs
THEN a track named "Transition FX" exists with 7+ audio clips at boundary positions

Requirement: Riser Before Climax

A riser/wash FX MUST start 2–4 beats before build→chorus and bridge→final boundaries, ending ON the boundary downbeat.

Scenario: Riser before chorus

GIVEN build ends at beat 64 (bar 16)
WHEN FX is built
THEN a riser at position 60 (beat 60), length 4, fade_in ≥ 1.0s

Scenario: Riser before final

GIVEN bridge ends at beat 176 (bar 44)
WHEN FX is built
THEN a riser at position 172, length 4, fade_in ≥ 1.0s

Scenario: Riser before chorus2

GIVEN verse2 ends at beat 128 (bar 32)
WHEN FX is built
THEN a riser at position 124, length 4, fade_in ≥ 1.0s

Requirement: Impact on Section Downbeat

An impact/stab FX MUST start on beat 1 of CHORUS (beat 64) and FINAL (beat 176).

Scenario: Impact on chorus beat 1

GIVEN chorus starts at beat 64
WHEN FX is built
THEN an impact clip at position 64, length 1–2 beats, fade_out ≥ 0.2s

Scenario: Impact on final beat 1

GIVEN final starts at beat 176
WHEN FX is built
THEN an impact clip at position 176, length 1–2 beats

Requirement: Transition Sweeps Between Verses

Short transition FX MUST bridge chorus→verse2 (beat 96) and chorus2→bridge (beat 160).

Scenario: Sweep bridges chorus to verse2

GIVEN chorus ends at beat 96
WHEN FX is built
THEN a transition clip at position 94, length 2 beats, fade_in and fade_out > 0

Requirement: FX Sample Selection

The system SHALL select FX samples via SampleSelector.select_one(role="fx"), favoring short samples for impacts, long for risers.

Scenario: FX role returns candidates

GIVEN 57 FX samples in library with ATONAL_ROLES including "fx"
WHEN select(role="fx") is called
THEN non-empty result returned; key scoring skipped (neutral 0.5)

Requirement: Fade Curves

FX clips MUST use fade_in/fade_out. Risers: fade_in ≥ 0.3s. Impacts: fade_out ≥ 0.2s.

Scenario: Riser fades in, impact fades out

GIVEN riser and impact clips defined
WHEN ClipDef is created
THEN riser.fade_in > 0 AND impact.fade_out > 0

Requirement: FX Track Mixing

The FX track SHALL have volume ≤ 0.80 and send to Reverb/Delay returns.

Scenario: FX track has moderate volume and sends

GIVEN "Transition FX" track created
WHEN track is defined
THEN volume = 0.72, send_level includes reverb (0.08) and delay (0.05)

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