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An introduction to Metric Halo MH TransientControl v4, based on information from the maker and distributors: what it does, how to use it and who it may suit. It is not scored.
TransientControl is a signal processor that allows you to modify dynamics in ways that just aren’t possible with traditional compressors.
— Metric Halo official site
What is MH TransientControl v4?
MH TransientControl v4 is a transient modifier from Metric Halo that directly adjusts the attack and sustain of audio. The maker describes it as a way to handle dynamics in ways traditional compressors cannot.
It analyzes the incoming sound and distinguishes the attack, the sustain and the decay (release). Three gain controls set the relative level of each of these elements.
You can push a track toward a punchier feel or soften attacks so it sits in the mix. The maker's examples include emphasizing finger-picked guitar, muting the attack of strumming, controlling the snap of a snare without affecting its ring, and changing the feel of a percussion pattern.
It works in real time with no latency, so it can be used for mixing and for live work. v4 adds VST3 support.
Independent attack and sustain
Raise or lower the onset and the sustain separately. It may suit cases where you want to act on the shape of a sound rather than hunting for a compressor threshold.
Three gain controls
Attack, sustain and release each have a gain control. You could change the snap of a drum while leaving its ring as is.
Gain-change display
The gain applied over time is shown visually, so you can see when and how much the processing is acting.
Three interface modes
Choose from simple, detailed and advanced interface views. The advanced controls let you modify the attack and release detectors.
Auto Sensitivity mode
Auto Sensitivity mode helps it work with signals at different levels, which could be useful for material recorded at inconsistent levels.
Presets and zero-latency processing
Many presets for varied uses are included. Processing runs in real time with no latency.
Specifications
| Item | Details |
|---|---|
| Type | Transient modifier |
| Controls | Three gains: attack / sustain / release |
| Interface modes | Simple / Detailed / Advanced |
| Formats | AU, VST2, VST3, AAX Native |
| macOS | macOS 10.10 or newer (Intel or Apple Silicon; AU, VST 2/3 or AAX; 64-bit) |
| Windows | Windows 7 or newer (Intel processor; VST or AAX; 64-bit) |
| Licensing | An iLok.com account is required for licensing (an iLok dongle is optional; iLok Cloud also works). One license covers both platforms and includes two activations |
What is included and system requirements
- MH TransientControl v4 plugin (AU, VST2, VST3, AAX Native)
- Presets
- MH Preset Manager
- A free, fully functional 30-day trial is offered on the maker's site
How to use it
- Create an iLok.com account and register your license after purchase.
- Install and rescan plugins in your DAW.
- Insert it on a track whose attack you want to adjust, such as drums, guitar or percussion.
- Load a preset to hear how it behaves.
- Move the attack gain first and listen to how the onset changes.
- Then move the sustain gain to adjust how long the tail lasts.
- For material with big level differences, try Auto Sensitivity mode.
- Fine-tune while watching the gain display, and compare with A/B snapshots.
Drums and percussion
It may suit emphasizing a snare's attack while keeping its ring, and could be used to fit a percussion pattern's feel to the song.
Acoustic guitar
The maker lists enhancing finger-picked attacks and softening strums as uses. It might be worth trying on home-recorded guitar tracks.
Fitting instruments into a mix
Reducing the attack may help tuck an instrument back in a mix, while raising it could bring an instrument forward.
Live and streaming
Because it runs with no latency, the maker says it can be used in live performance as well as mixing.
Who it may suit
- People who want to shape drum or guitar punch by a method other than compression
- Home recordists who want to adjust attack strength after recording
- People looking for a plugin usable in live or real-time settings
Good to know before you buy
- An iLok.com account is required for authorization.
- Supported on 64-bit macOS 10.10 or newer and Windows 7 or newer.
- It is included in the Production Bundle, which the maker offers as a bundled purchase.
- v4 adds VST3 on both macOS and Windows, including Apple Silicon native support, so it runs in major VST hosts such as Cubase and Nuendo.
- Shared v4 additions include undo/redo, A/B snapshots with snapshot blend, common header-bar controls, and copy-and-paste of settings between plugin instances.
How it differs from similar products
We do not pick a winner; the official figures are placed side by side.
MH Multiband Expander v4
TransientControl v4 adjusts attack, sustain and release with three gains and is listed at $179. Multiband Expander v4 uses three-band expanders to suppress noise and is also listed at $179. One reshapes the time envelope, the other lowers quiet content band by band.
Price
$179 (Metric Halo official site, checked 2026-10-27). Prices can vary by region and promotion, so check the official page before buying.
See MH TransientControl v4 on the product page
Sources: minet.jp mhsecure.com (checked 2026-10-27)
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