Audio Diagnostics

Real-time AudioContext health · MediaStream · Signal path integrity

AudioContext

uninitialized

t = —s

MediaStream Track

none

disabled · unmuted

Limiter Reduction

0.0 dB

Master Gain: —

Anomalies (last 10s)

✓ Clean

Total logged: 0

Input RMS— dBFS

Output RMS— dBFS

30-Second Output Waveform History0 samples

Mix Node Connectivity

○ masterInputGain

○ protectionLimiter

○ masterOutputGain

○ → ctx.destination

Signal path: [All Engines] → masterInputGain → protectionLimiter → masterOutputGain → ctx.destination

15-Second Diagnostic Logger

Confirms mix nodes stay connected and audio path holds for full duration

Full-Load Stress Test — All 16 Pedals

5-minute test: recording + playback + mixing + input monitoring simultaneously

🎛

Click Start Monitoring to begin real-time AudioContext diagnostics.

Requires microphone permission. Monitoring taps the live audio engine without altering signal flow.

🔬 Runtime Web Audio API Inspector

Monkey-patches every Web Audio API call to identify the exact runtime source of the hum. Install the patch, take Snapshot A, open an FX processor, take Snapshot B, then diff.

WEB AUDIO RUNTIME INSPECTOR
EVENTS0
CONTEXTS0
RESUMES0
DEST CONN0
STREAMS0
SNAPSHOT DIFF:→ open FX processor →
RUNTIME AUDIO SOURCE TRACE — INVESTIGATION PROTOCOL
STEP 1Install the Patch
• Click "▶ INSTALL PATCH" above
• Every Web Audio API call will now be intercepted and logged
• All calls appear in the LIVE tab and in the browser console
STEP 2Before/After Snapshot Diff
• Click "TAKE SNAPSHOT A" before opening any FX processor
• Open the FX processor you want to test
• Click "TAKE SNAPSHOT B" immediately after
• The diff shows EXACTLY what changed — new contexts, nodes, resumes, connections
STEP 3Who called resume()?
• Check the LIVE tab filtered to "resume" type
• Each resume() event shows the full stack trace
• The component and file that triggered resume() is shown
STEP 4Who connected to destination?
• Destination connections are highlighted in RED in the LIVE tab
• The DEST CONN counter in the stats bar shows the count
• Click any event to expand the full stack trace
STEP 5–6If No Web Audio Changes
• If the diff shows "NO CHANGE", the hum is NOT from Web Audio
• Check the REPO tab for all HTMLAudioElement, new Audio(), autoplay patterns
• Check browser audio settings: Windows "Listen to this device", macOS Input Monitoring
• Check Bluetooth audio device mode (HFP vs A2DP)
• Check USB audio interface monitoring settings
STEP 7Conclusion
• If absolutely NO runtime audio objects change when the hum starts:
• The source is EXTERNAL to the Web Audio API
• The fix is in the OS/hardware layer, not in code
⚠️ KNOWN ARCHITECTURE FACTS (from previous investigation)
• AudioContextManager — singleton, creates 1 AudioContext
• UniversalFXDSPEngine.buildChannel() — called by UniversalFXChain on first interaction
• buildChannel() creates: modLFO (OscillatorNode, gain=0), tremoloLFO (OscillatorNode, gain=0), denormalDC (ConstantSourceNode, offset=1e-30)
• enumerateDevices() — no getUserMedia, no OS hardware activation
• AuraFXMasterContext.resumeAudioContext() — called on user gesture, creates masterGain + limiter
• WorshipAudioEngine — creates oscillators for metronome/pads (short-lived, stopped after use)

⚡ Phase 6 — Unified FX Runtime Health

⚡ UNIFIED FX RUNTIMEPhase 4

● HEALTHY

Active Processor

none⚠ WARN

Engine Running

NO✕ FAIL

Demo Mode

NO✓ PASS

Sample Rate

48,000 Hz✓ PASS

Audio Latency

0.0 ms✓ PASS

DSP Time

0.00 ms✓ PASS

Buffer Size

Auto✓ PASS

CPU Usage

0.0%✓ PASS

Uptime

0s✓ PASS

Latency Profile

Live Performance✓ PASS

MIDI Inputs

0⚠ WARN

Protection

NONE✓ PASS

🎛Devices

Input Device

None⚠ WARN

Output Device

Default✓ PASS

HW Interface

None

Driver

Unknown

📊Live Audio Meters (AnalyserNode)

Input RMS

Output RMS

Peak

CPU Load

Clip✓ OK-∞ dB

🔧Active DSP Modules (0)

None (engine not running)

🎵 Pitch Shifter — Granular OLA Verification

Tests 1–10 from specification · Algorithm: 2^(semitones/12) · AudioWorklet: granular-pitch-shifter-processor.js

Click Run Tests to verify the granular pitch-shifter implementation.