01Phase 01
Stationary Noise Profiler
Scans quiet pauses across your track, scoring RMS variance and spectral flatness to isolate pure 1.0s–2.0s acoustic room ambience with no speech transients.
Room Tone Matcher
Extract acoustic noise floors from speech recordings and synthesize seamless ambient room tone loops using overlap-add (OLA) crossfades.
Natural Pause & Dialogue Review Studio
Ready for a local audio or video file
Local Browser Audio Engine
Scanning speech & quiet pauses…
Reading media and computing RMS energy…
1Reading file
2Decoding audio
3Scanning quiet
4Building map
Loudness:-16.0 LUFS
Peak:-1.0 dBFS
0:00 savedPacing Preset
Speech cushionsFine-tune detection parameters
Balanced
Balanced (~-38dB): Calibrated natural balance recommended for podcasts, YouTube videos, and dialogue.
0.80s
0.20s (all micro-pauses)2.50s (only long pauses)
0.32s
0.00s (flush / jump)0.80s (spacious)
Automatically removes silence before first speech and after last speech.
Pause #01✂️ Cut Proposed
00:14.2 → 00:16.8 (2.6s gap)
1.6s quiet gap; keeps 0.32s breathing room.
Tip: Press Del or Backspace to cut selected silenceR to keep
Silence Map (0)
0 silences found (0.0s dead air) · 0 will be cut, 0 kept
Target ScopeAll Clips
All edits reversible
Studio DSP & Ambience Rack
Real-Time DSP✨
1-Click Full Background Noise Removal
Removes 80Hz rumble, 50/60Hz hum, room hiss & mouth clicks
Anti-Blackout
Fills shortened silence gaps with authentic room tone synthesized from your recording, eliminating unnatural "vacuum dropouts".
Butterworth
-40 dBFS
+2.5dB Clarity
Sibilance
Cubic Spline
-1.0 dBFS
Subtitle Range Protection
Protect Intentional Sentences & Pauses
Importing your subtitle transcript locks dialogue boundaries so dramatic reflections and deliberate speech pauses inside sentences are never auto-cut.
No subtitles loaded
Hesitation Splicer (Fillers & Stutters)
Removes verbal hesitation sounds (um, uh, er, like) and repeated stutters.
0 fillers0 stutters
Merged with acoustic cuts
A/V Dual-System Sync
Drift ConformerEdit Evidence & Provenance
Manifest v1.0Total Proposals
0
Active Cuts
0
Restored Pauses
0
Protected Lines
0
Structural Export Validation:
✔ Zero server uploads (100% Client-Side)
✔ True-Peak Limiter ceiling ≤ -1.0 dBFS
✔ Duration conservation verified (Δ ≤ 5ms)
✔ 8ms anti-click zero-crossing micro-fades
Media Preflight & Capabilities
Source Format:Audio Track
Sample Rate:44.1 kHz
Channels:Stereo (2-ch)
Memory Footprint:~12 MB RAM
Local Processing:100% Client-Side
Verified Export Options:
- ✔ 16-Bit PCM WAV: Uncompressed lossless master audio.
- ✔ Audacity Labels: Drag-and-drop label track for Audacity / Reaper.
- ✔ CSV Cue Sheet: Tabular marker list with exact timestamps.
- ✔ EDL / FCPXML: Timeline cut lists: EDL for Premiere & Resolve, FCPXML for Final Cut & Resolve.
- ✔ Evidence Manifest: JSON & CSV audit trail with a CRC-32 source checksum.
Episode Show Notes
Silence #01 detected (00:04.4 → 00:05.0)
🎬Sequence Track1 clip
Pause Map & Timeline
Click / drag to scrub0:000:00
✨
✨ Cleaning Noise...Background Noise Remover
Multi-band spectral Wiener filtering & room rumble removal
Strong (75%)
0% (Off)50% (Balanced)100% (Studio Max)
Space Play/Pause · Del Trim · R Keep · J/L Jump 2sDouble-click waveform to trim
Lossless 16-Bit Master Audio & Edit Ledger Export
Rendered locally in browser memory with 8ms anti-click micro-fades. Zero server upload.
Detected from video
Chain in Studio FlowTimeline files reference your media by file name only. Final Cut Pro, DaVinci Resolve or Premiere Pro will ask you to relink the clip to the original file.
✨ Hover any tool icon to see what it does · Click to launch
100% browser-local processing · Equal-power cosine crossfades
Acoustic Room Tone Guide · Architecture
The science of acoustic ambience continuity in browser memory
Why professional dialogue editors never leave digital zero between cuts, and how AutoSilenceCut automates high-end room tone matching.
02Phase 02
Equal-Power OLA Crossfade
Synthesizes an infinite ambient loop using Overlap-Add (OLA) equal-power cosine crossfades, eliminating cyclic boundary thumps and phase cancellation.
03Phase 03
Anti-Blackout Gap Padding
Subtly blends the synthesized ambience into cut intervals at your calibrated noise floor gain, maintaining continuous acoustic immersion.
Where Room Tone Matching is Essential
Elevates spoken recordings from amateur cuts to professional broadcast deliverables.
ACX Audiobook Standards
Meets Audible and ACX quality benchmarks by preserving continuous natural room presence between chapters and dialogue lines.
Multi-Host Podcast Smoothing
Bridges disparate microphone noise floors and prevents audible room dropout when switching between speakers.
Film & Video Dialogue ADR
Eliminates unnatural silence holes during ADR line replacements and automated jump cut sequences.
Connected finishing workflows
Explore companion utilities for dialogue cleanup, speech pacing, and mastering.
Audio Standards & Research
Engineering guides & deep-dive workflows
Explore the acoustic principles, room tone preservation techniques, and noise floor matching standards.
Room Tone7 min read
How to Keep Room Tone When Cutting Dialogue
Why absolute zero dBFS cuts sound jarring. Learn how noise floor fingerprinting and overlap-add (OLA) loop synthesis bridge trimmed gaps seamlessly.
De-Reverb8 min read
How to Remove Room Reverb from Spoken Voice Recordings
Understanding room impulse response: early reflections vs reverberant decay tails, downward envelope expansion, and frequency-dependent attenuation.
Mains Hum6 min read
How to Reduce Hum and Low Rumble in a Voice Recording
Pinpoint 50Hz/60Hz electrical harmonics and sub-80Hz mechanical rumble with steep Butterworth high-pass and notch filtering.
Frequently asked questions
Learn how acoustic room tone matching protects listening comfort in dialogue editing.
What causes the "vacuum / digital black" effect in silence removal?+
When conventional noise gates or audio cutters delete pauses, the background noise drops abruptly from the microphone’s natural room floor to absolute digital zero (-∞ dBFS). To the human ear, this creates a jarring, artificial "sucking" sensation between words.
How does AutoSilenceCut match and synthesize room tone?+
AutoSilenceCut scans candidate quiet pauses across the recording, computes rolling RMS energy variance to reject speech transients, and isolates the cleanest 1.0s–2.0s acoustic profile. It then uses Overlap-Add (OLA) equal-power cosine crossfades to synthesize an infinite, seamless room tone loop.
Can I adjust the room tone level during dialogue cuts?+
Yes. The Studio DSP Rack allows you to toggle Room Tone Ambience Bed on or off and calibrate the ambient fill gain so it blends seamlessly with the natural microphone noise floor.
What if my recording has no clean silent pauses?+
If every pause contains background rustle or speech bleed, the engine automatically generates a calibrated stationary comfort noise bed filtered to match typical acoustic studio profiles with zero harsh high-frequency hiss.
Is room tone processing safe for confidential recordings?+
Yes. All variance scoring, FFT profiling, loop synthesis, and audio blending execute 100% locally inside your browser Web Audio engine. No audio bytes or noise profiles are ever transmitted to any external server.
Workflow Mesh
Complementary Room Tone & Acoustic Tools
Synthesize room tone loops, eliminate digital blackouts, and master audio acoustics.