Dialogue enhancement. Automatic ducking. ADR matching. Loudness compliance. Delivery format mastering. Full post-production mixing. Upload your stems, pick a delivery format, and get broadcast-ready audio. Free during beta.
Re-recording mixers, post houses, and indie filmmakers delivering to cinema, broadcast, or streaming platforms.
Podcast networks and independent podcasters who need consistent loudness, clear dialogue, and music that ducks automatically.
Ad agencies, production companies, and promo editors delivering commercials to broadcast standards with tight deadlines.
Video creators and influencers who want professional audio without learning a DAW. Upload, process, download.
Netflix wants -27 LUFS. YouTube wants -14 LUFS. Broadcast needs strict EBU R128. Each delivery is a different spec.
Dialogue competes with music and SFX. Manual ducking and automation takes hours per project.
Fail a loudness check and you're back to square one. Compliance is tedious, repetitive work.
PostMix handles all of it automatically.
PostMix automates the most time-consuming parts of audio post-production. Whether you're preparing a podcast episode for Apple Podcasts, mastering a short film for Netflix loudness compliance, or mixing a TV commercial to EBU R128 broadcast standards, PostMix handles the loudness normalization, true peak limiting, dialogue enhancement, and sidechain ducking in one step.
Features
Three processing modes tuned to your content type. Preserve for documentaries and naturalistic content. Enhance for TV, streaming, and interviews. AD Enhanced for commercials, announcements, and voiceover. The engine analyses noise floor, frequency balance, clipping, and reverb before applying any processing.
Seven presets calibrated to industry loudness standards: Film (-24 LUFS), TV (-23 LUFS), Streaming (-27 LUFS), YouTube (-14 LUFS), Broadcast (EBU R128), Ad Mix (-23 LUFS), and Podcast (-16 LUFS). True peak limiting and LRA control included.
Background audio ducks when dialogue plays. Five presets: Light (-6 dB), Medium (-12 dB), Heavy (-20 dB), AD Mix (-22 dB), and fully Custom. Multi-track ducking supported: one dialogue sidechain controls multiple background tracks simultaneously.
Programme loudness, dialogue loudness, true peak, programme LRA, dialogue LRA. All measured and reported as pass/fail against your target delivery format. No more QC rejections. Costs a fraction of a full process: just a quick analysis of your existing mix.
Match re-recorded dialogue (ADR) to the acoustic character of original location sound. The engine matches frequency response, dynamics, timbre, and reverb characteristics. Choose from Dry, Small Room, Medium Room, Large Room, or automatic matching to your reference recording. Similarity scores reported back.
The complete pipeline in one step. Upload all your stems (dialogue, music, SFX, foley, ambience), configure dialogue enhancement and ducking, select a delivery format, and get a broadcast-compliant mix with compliance report and optional processed stems. Up to 16 tracks per session.
Every streaming platform and broadcaster has its own audio delivery specification. Netflix requires -27 LUFS with dialogue gating. YouTube normalizes to -14 LUFS. Broadcast TV follows EBU R128 at -23 LUFS. Getting your audio to pass QC across all these platforms used to mean re-mastering for each. PostMix ships with seven calibrated delivery format presets that target the correct loudness, true peak, and LRA for each platform.
Reference
Every format has different requirements. PostMix handles them all.
| Format | Target LUFS | True Peak | Programme LRA | Dialogue LRA | Standard |
|---|---|---|---|---|---|
| Film | -24 LUFS | -2 dBTP | 6-20 LU | ≤12 LU | Cinema / Dolby reference |
| TV | -23 LUFS | -2 dBTP | 5-15 LU | ≤10 LU | EBU R128 |
| Streaming | -27 LUFS | -2.3 dBTP | 4-18 LU | ≤10 LU | Netflix, Amazon, Apple TV+ |
| YouTube | -14 LUFS | -1 dBTP | 4-16 LU | ≤10 LU | YouTube recommended |
| Broadcast | -23 LUFS | -1 dBTP | 5-15 LU | ≤10 LU | Strict EBU R128 |
| Ad Mix | -23 LUFS | -1 dBTP | 3-12 LU | ≤8 LU | EBU R128 for advertising |
| Podcast | -16 LUFS | -1 dBTP | 3-15 LU | ≤10 LU | Podcast standard |
Comparison
| Feature | PostMix | Auphonic | DAW Plugins (iZotope, NUGEN) | Adobe Podcast Enhance | Manual in NLE |
|---|---|---|---|---|---|
| Dialogue Enhancement | 3 AI modes | Basic leveling | Per-plugin | Speech only | Manual EQ/comp |
| Sidechain Ducking | 5 presets + custom | Basic ducking | Requires sidechain setup | No | Manual keyframes |
| ADR Matching | Automatic (frequency, dynamics, timbre, reverb) | No | Not available | No | Manual matching |
| Delivery Format Presets | 7 formats | Custom targets | Manual setup per format | No | Manual per platform |
| Loudness Compliance Report | Full pass/fail (5 metrics) | Basic loudness | Metering only | No | Metering only |
| Full Multi-track Mix | Up to 16 tracks | Multitrack available | Manual in DAW | Single track | Manual |
| Setup Required | None (web app) | Account + upload | Install plugins + DAW | Upload | DAW required |
| Price | Free during beta | Free 2hr/month, then paid | $100-$500+ for plugins | Free (limited) | Free (your time) |
Process
Drag and drop your dialogue, music, SFX, foley, and ambience tracks. Label each with its content type.
Configure your processing. Choose from six services: dialogue enhancement, delivery format mastering, sidechain ducking, loudness compliance check, ADR matching, or the full post-production mix pipeline.
Download your processed audio, compliance report, and optional stems. Compare before and after. Re-run with different settings if needed.
Listen
Streaming delivery format. Dialogue enhancement (Enhance mode). No ducking.
Ad Mix delivery format. AD Enhanced dialogue. Sidechain ducking enabled.
FAQ
PostMix accepts WAV, AIFF, and FLAC files. Maximum track length is 10 minutes. You can upload up to 16 tracks per session for multi-track services (ducking, full mix).
EBU R128 is the European Broadcasting Union's loudness recommendation for broadcast audio. It specifies a target loudness of -23 LUFS with a true peak limit of -1 dBTP. Most TV broadcasters and many streaming platforms base their delivery specs on EBU R128. If your audio doesn't meet the spec, it gets rejected at QC.
LUFS stands for Loudness Units relative to Full Scale. It's the standard measurement for perceived loudness used by streaming platforms and broadcasters. Different platforms require different LUFS targets: Spotify and YouTube normalize to around -14 LUFS, broadcast TV uses -23 LUFS (EBU R128), and Netflix uses -27 LUFS with dialogue gating.
Dialogue gating measures the loudness of only the speech portions of your audio, ignoring music and effects. Netflix and other streaming platforms use dialogue-gated loudness to ensure speech is consistently audible. PostMix measures and reports both programme loudness and dialogue loudness.
LRA measures the dynamic range of your programme material in Loudness Units (LU). A high LRA means big differences between quiet and loud sections. Delivery specs often constrain LRA to ensure comfortable listening. PostMix measures both programme LRA and dialogue LRA, and reports whether they're within spec.
ADR (Automated Dialogue Replacement) is re-recorded dialogue that needs to match the acoustic character of the original location recording. PostMix's ADR matching analyses the reference audio's frequency response, dynamics, timbre, and reverb, then processes the ADR recording to match. This saves hours of manual processing.
PostMix is free during the beta period. We're using the beta to learn what post-production professionals need most. After beta, pricing will be introduced.
Yes. Audio processed through PostMix during the beta can be used in commercial projects.
Auphonic is excellent for podcast loudness normalization and basic audio cleanup. PostMix goes further with dedicated post-production features: three dialogue enhancement modes, ADR-to-location matching, multi-preset sidechain ducking, and full multi-track post-production mixing with 10 native track types. PostMix is built for film, TV, and advertising workflows, not just podcasts.
PostMix replaces a chain of individual plugins (loudness meter, limiter, de-esser, compressor, ducker) with a single automated pipeline. It's faster for delivery prep and QC compliance. For creative mixing decisions that need per-sample control, a DAW with plugins is still the right tool. PostMix is complementary: use it for the final delivery stage.
Developers
All of PostMix's capabilities are available as API endpoints. Dialogue enhancement, delivery format mastering, sidechain ducking, loudness compliance checking, ADR matching, and full post-production mixing. Same credit system as the Tonn music API. No separate account needed.
PostMix is free during beta. Sign up to be notified when we launch.
No spam. One email when PostMix is ready.