Did you also play the same thing in each recording? If one recording had a tom-heavy beat with no snare and the other one had no toms (for example) - it makes sense that Auto-Align will choose a different Performance (Key) Time track for each recording.
(In Auto-Align 2.1.0 Open Beta we renamed Key Time as Performance Time )
Thank you, Oran. I played about three minutes of drums and saved it with no plugins added. Closed it out. Reopened it . Added auto align to the performance . Saved that file as a save as. Then repeated the test two more times each time using the original file.
Although both Auto-Align and Pi strive to optimize phase correlation, each one solves a different phase related issues using very different techniques.
Auto-Align was designed to fix the Comb-filter effect caused by multi-mic recording of a single source, where the mics are placed at different distance from the sound source. When summed in a mix, the difference in time of arrival to each mic causes a phase shift that varies throughout the frequency range and cannot be fixed using a phase rotator. Auto-Align automatically detects the distance and the delay between the mics and compensates for it sample accurately.
Pi, is a multi-channel-aware dynamic phase rotator. It analyzes the tracks in your mix in real time and constantly rotates their phase to improve phase correlation. Pi minimizes cancellations of overlapping frequencies when they interact with each-other. Auto-Align is more effective for multi-microphone/ DI recordings, and Pi is suitable for general phase optimization of your mix.
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On a multitrack drum recording, alignment problems occur because the various kit elements get picked up by different mics, each in a different position relative to the source. That means the waves arrive at slightly different times into each mic and thus get recorded out of alignment.
Auto Align and similar plugins line up the hits on the various tracks, eliminating those delays. The result is a tighter sound with snappier transients. Auto Align also checks for polarity inversions, which can cause significant phase cancellation.
When you use Auto Align on drums, you put an instance of the plugin on each drum track. You can then individually assign a send and a receive channel for each. All the open instances of Auto Align can communicate with each other. You choose a drum element as a timing reference and designate which of the others you want to sync to it. You can have more than one timing reference in a multitrack drum mix.
He aligns the stereo overheads to the mono overhead. He aligns the tom mics to each other in placement order. The first concert tom gets aligned with OH Floor, and then each successive tom gets aligned to the one next to it.
Software updates come in many forms. Some are minor maintenance releases, others offer a few or many new features, and once in a while, you get an update that fundamentally changes the workflow of a product. Auto-Align 2 (Mac/Win) falls into that last category.
The plug-in also looks for and corrects tracks that are out of polarity with each other. This automatic polarity matching saves you from the tedious process of auditioning various track pairs and checking whether they sound better together with the polarity reversed.
Sound Radix recommends instantiating the plug-in on all audio tracks as early in the mixing process as possible before you get into significant editing. The company says that the more data available for the plug-in to analyze, the better the results.
That one button push I referred to earlier is the Align button. You put your DAW transport into Play, press Align, and Auto-Align 2 begins analyzing your tracks. If you stop the playback before 30 seconds, a dialog box tells you that the plug-in needs more data to work correctly. The manual recommends letting the song run from beginning to end.
Next to each grouped track is a text field that shows how much it was offset in the time-alignment process. You can choose to view the data in samples, milliseconds, centimeters or inches. Positive values indicate that the track was moved forward. Negative values indicate that it was moved backward.
The distance measurements of the offsets indicate how far the sound would have to travel to align with the Key Time Track and equates with the distance between the spot mic on the source and the other mics where the source gets recorded as bleed.
Solid green indicates that no polarity or phase adjustments were necessary. Solid red tells you that a 180-degree polarity reversal was implemented. A multi-colored display shows that Auto-Align 2 applied its Spectral Phase Optimization.
You can also switch the Visualizer into Spectral Phase Optimization mode, which uses bar-graph style lines and functions like a stereo correlation meter. Selecting a track shows the frequencies in it that are canceling, adding or not impacted vis a vis the other tracks in the Group.
Over several weeks, I used Auto-Align 2 on several mixes and was impressed with its simplified workflow and the power of its new algorithms. Between the timing offsets, spectral phase optimization and polarity adjustments, Auto-Align 2 can add punch and clarity to your mix.
Since its introduction in 2018, Sound Radix Auto-Align Post has helped deliver outstanding sounding dialogue in countless award-winning films and TV shows. It saved dialogue editors days of tedious work and became an essential tool for many audio-post professionals.
By enabling dynamic time-alignment correction of moving location microphones, Auto-Align Post makes it possible to effectively mix the boom and lav microphones by eliminating comb-filtering and phase artifacts caused by the time-of-arrival differences, with just a few clicks.
Back in 1994, the year Mediaspec started, digital technology was in its infancy. Back then our aim was straightforward - provide technology products and services to the education, music, television and film markets. We were amongst the first dedicated companies to offer the type of cutting edge technology that now grace recording studios the world over, and 25 years on, we have...
Select the audio clips you would like to align, go to the Window menu extensions, and select Auto-Align Post.
In the reference track selector choose the reference track. Usually, that would be the boom mic. Click render. Done.
Since its introduction in 2018, Auto-Align Post has helped deliver outstanding-sounding dialogue in countless award-winning films and TV shows. It saved dialogue editors days of tedious work and became an essential tool for many audio-post professionals. Enabling dynamic time-alignment correction of moving location microphones, Auto-Align Post makes it possible to effectively mix the boom and lav microphones by eliminating comb-filtering and phase artifacts caused by the time-of-arrival differences, with just a few clicks.
Auto-Align Post 2.1 takes an extensive step further by introducing a new spectral phase correction module, refined algorithm, and user interface. It brings native Apple silicon support for ARA2-VST3 in compatible DAWs and Adobe Premiere Pro extension compatibility.
Enabling dynamic time-alignment correction of moving location microphones, Auto-Align Post makes it possible to effectively mix the boom and lav microphones by eliminating comb-filtering and phase artifacts caused by the time-of-arrival differences, with just a few clicks.
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