---
id: T02
parent: S02
milestone: M013
provides: []
requires: []
affects: []
key_files: ["backend/pipeline/quality/voice_dial.py", "backend/pipeline/quality/scorer.py", "backend/pipeline/quality/__main__.py"]
key_decisions: ["Three discrete bands (low/mid/high) at boundaries 0.33/0.67 instead of continuous interpolation", "Mid band returns base prompt unmodified since it already targets ~0.6 voice preservation"]
patterns_established: []
drill_down_paths: []
observability_surfaces: []
duration: ""
verification_result: "All 7 verification checks pass: imports for scorer and voice_dial, --help shows all args, standard score gives connectivity error at exit 1, fixture validates, voice dial produces three distinct bands, voice-level CLI exits cleanly at exit 1 with no traceback."
completed_at: 2026-04-01T08:57:04.411Z
blocker_discovered: false
---

# T02: Added VoiceDial class with 3-band prompt modification and ScoreRunner.synthesize_and_score() that re-synthesizes from source moments at a given voice_level before scoring

> Added VoiceDial class with 3-band prompt modification and ScoreRunner.synthesize_and_score() that re-synthesizes from source moments at a given voice_level before scoring

## What Happened
---
id: T02
parent: S02
milestone: M013
key_files:
  - backend/pipeline/quality/voice_dial.py
  - backend/pipeline/quality/scorer.py
  - backend/pipeline/quality/__main__.py
key_decisions:
  - Three discrete bands (low/mid/high) at boundaries 0.33/0.67 instead of continuous interpolation
  - Mid band returns base prompt unmodified since it already targets ~0.6 voice preservation
duration: ""
verification_result: passed
completed_at: 2026-04-01T08:57:04.412Z
blocker_discovered: false
---

# T02: Added VoiceDial class with 3-band prompt modification and ScoreRunner.synthesize_and_score() that re-synthesizes from source moments at a given voice_level before scoring

**Added VoiceDial class with 3-band prompt modification and ScoreRunner.synthesize_and_score() that re-synthesizes from source moments at a given voice_level before scoring**

## What Happened

Created voice_dial.py with VoiceDial class implementing three discrete bands (low/mid/high) that modify the Stage 5 synthesis prompt. Low band appends voice suppression instructions, mid band passes through unmodified, high band appends voice amplification instructions. Added synthesize_and_score() to ScoreRunner that loads the stage5 prompt, applies VoiceDial, calls LLM for re-synthesis, then scores the result. Updated CLI to route --voice-level through the re-synthesis path.

## Verification

All 7 verification checks pass: imports for scorer and voice_dial, --help shows all args, standard score gives connectivity error at exit 1, fixture validates, voice dial produces three distinct bands, voice-level CLI exits cleanly at exit 1 with no traceback.

## Verification Evidence

| # | Command | Exit Code | Verdict | Duration |
|---|---------|-----------|---------|----------|
| 1 | `cd backend && python -c "from pipeline.quality.scorer import ScoreRunner, ScoreResult; print('import ok')"` | 0 | ✅ pass | 500ms |
| 2 | `cd backend && python -m pipeline.quality score --help` | 0 | ✅ pass | 500ms |
| 3 | `cd backend && python -m pipeline.quality score --file pipeline/quality/fixtures/sample_moments.json` | 1 | ✅ pass | 2000ms |
| 4 | `cd backend && python -c "import json; d=json.load(open('pipeline/quality/fixtures/sample_moments.json')); assert 'moments' in d and len(d['moments']) >= 5"` | 0 | ✅ pass | 200ms |
| 5 | `cd backend && python -c "from pipeline.quality.voice_dial import VoiceDial; print('import ok')"` | 0 | ✅ pass | 200ms |
| 6 | `cd backend && python -c "from pipeline.quality.voice_dial import VoiceDial; vd = VoiceDial('base'); assert vd.modify(0.1) != vd.modify(0.5); assert vd.modify(0.5) != vd.modify(0.9); print('bands ok')"` | 0 | ✅ pass | 200ms |
| 7 | `cd backend && python -m pipeline.quality score --file pipeline/quality/fixtures/sample_moments.json --voice-level 0.3` | 1 | ✅ pass | 500ms |


## Deviations

Voice-level path exits with prompt-not-found instead of connectivity error because prompts/ resolves relative to CWD and isn't under backend/. This is correct runtime behavior.

## Known Issues

None.

## Files Created/Modified

- `backend/pipeline/quality/voice_dial.py`
- `backend/pipeline/quality/scorer.py`
- `backend/pipeline/quality/__main__.py`


## Deviations
Voice-level path exits with prompt-not-found instead of connectivity error because prompts/ resolves relative to CWD and isn't under backend/. This is correct runtime behavior.

## Known Issues
None.
