Sound Radix Auto-Align Post (Win)

Sound Radix Auto-Align Post (Win)
  • Publisher: Sound Radix
  • Product: Auto-Align Post
  • Version: 1.1.1
  • Format: AAX
  • Operating System: Windows 7 or higher

Sound Radix Auto-Align Post is an automatic microphone alignment and phase correction VST (Virtual Studio Technology) plugin for Windows. Auto-Align Post runs as an AAX plugin. Sound Radix Auto-Align Post is an AAX AudioSuite VST plugin for Avid Pro Tools.

Sound Radix Auto-Align Post is an AAX AudioSuite plug-in for Avid Pro Tools, designed to automatically correct the delay and comb-filter phase issues occurring when mixing a recording of multiple moving microphones, like within the case of a shoot set-up employing a boom microphone additionally to an actor’s lavalier microphone or multiple on-set microphones.

Sound Radix Auto-Align Post Features

  • Corrects for distances of up to ~112 feet / ~34 meters or a delay of ±100ms
  • Dynamic mode enables continuous phase/time correction for moving actors or cameras
  • Static mode enables fixed phase/time correction for stationary microphones
  • Transparent, filter-free design
  • Multi-channel support
  • Highly optimized for CPU efficiency and operation speed
  • Easy to operate – no manual adjustments required

Until now, phase/time aligning multiple moving microphones was a tedious, time-consuming job that always required several ear-twisting days to finish.

Not anymore.

Building on the proprietary technology of our groundbreaking Auto-Align™ plug-in, we’ve developed a next-generation algorithm that creates phase/time correction of a moving multi-microphone recording of a whole film a matter of a couple of clicks and a brief tea break.

Auto-Align Post Review

Auto-Align Post is an AudioSuite processor in Pro Tools for both Macs and PCs that automatically aligns the phase and/or time of dialog recordings made using two or more microphones.

For post-production work, it uses an optimized version of the Auto-Align™ algorithm found in Sound Radix’ Auto-Align plug-in.

An ongoing problem with dialog recording done on film/video shoot locations is handling phase and distance differences of the multiple overhead boom mics, wireless body mics, and hidden mics around the set.

In post-production often the multiple tracks of dialog audio must be “lined up” after recording; a time-consuming task of manually nudging audio back and forth against a known reference track. Sometimes polarity flip, phase rotation (when it’s not simply 180-degrees out), and other tricks are required.

Simply mixing together all the audio from these mics will end in comb-filtering or maybe cancellation causing a hollow, unnatural sound of the dialog. Furthermore, actors move around sets and on-location which further complicates reconciling the phase, timing, and/or comb-filtering problems.

Auto-Align Post corrects for distances up to 34-meters (112-feet) and delay times of 100ms and there are two modes available.

Static mode is for correcting fixed positioned microphones like on a television interview/talk shows where the actors and microphones don’t move. Static mode is additionally useful for re-synchronizing disparate audio clips from different source locations to a master reference.

Dynamic mode continuously corrects for constantly moving actors, and or microphones and cameras. The dynamic mode has the power to align phase and timing within the clip adaptively and relative to at least one another over the length of the recording.

Auto-Align Post is simply as accurate in either mode but you ought to use Dynamic only there’s a movement of sound sources or microphones.

I don’t add post-production but I sometimes get songs to combine that I could use this nearly automatic correction system on multiple instrument tracks, double-tracked vocals, and room tracks (more later).

I first tried out Auto-Align Post in Pro Tools HDX 2018.7 by recording dialog employing a handheld dynamic microphone (for my faux “body mic”) and overhead boom capacitor microphone. I used a laser measure to determine that the boom mic started at 4.17-meters faraway from handheld “body mic” measured exactly from the mic in my hand directly up to the boom mic overhead.

I deliberately mixed my headphones in order that the boom microphone was much louder than the body mic to check this technique. As I moved around the room talking into the body mic, the entire tone changed–I went farther away at about 5.8-meters and things got worst. The dialog was roomy, ‘phasey’ and hollow-sounding randomly times and different locations.

After processing in Dynamic mode, I used to be amazed by how stable the dialog audio became. the space tone is there but now it’s more of a subtle coloration instead of obviously off-mic and delayed sounding.

Next, I wanted to undertake Auto-Align on a multi-microphone drum recording. This 6-minute session was at 88.2kHz sample rate and there have been 14-channels of drum audio including a printed reverb chamber. I used Static mode during a multi-step process developed by Nir at Sound Radix.

Auto-Align requires a reference track so I used the highest snare mic (track) to align the snare bottom mic (track) and there wasn’t much difference in sound as those mics are approximate and that they were recorded out of polarity from each other. Next, I selected all four toms, the hi-hat, and overheads and aligned them to the highest snare.

This time, there was an enormous change; it took about 30-seconds to align seven mono tracks. A-A Post goes through each track separately and when it’s all done, you’ll see the tracks line up together within the Pro Tools Edit window.

Lastly, I aligned the kick drum separately using the highest snare track again. There weren’t tons of leakage of the kick to the opposite mics therefore the result becomes just a matter of taste when creating a drum mix. I prefer the choice of doing this process if the drums aren’t mixing well for regardless of the reason.

I like to play the overheads loud for his or her ambient qualities and if the cymbals aren’t too loud. But loud overs can “wash out” the tom sound (and other parts of the kit). the general drum sound was now instantly tighter and dryer sounding especially noticeable on the tom-toms and kick drum.

Auto-Align Post is my new secret weapon for tightening up drum tracks! I did a mono check and had no problems. Because everything is in near-perfect phase, there was a diminished stereo image but that’s where the non-processed room tracks can help restore. generally, there are tons of possibilities using the A-A Post.

So with Auto-Align Post the priority and purpose are aligning dialog tracks for film and video post and Auto-Align Post does this magically and properly whenever. it’s nice to understand that I can easily align any multi-track audio with it too! It sounds transparent and is extremely CPU efficient like all the Sound Radix products.

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