MeldaProduction MAutoAlign Manual

MeldaProduction Audio Software MAutoAlign

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MAutoAlign

Overview

Phase cancellation is a constant problem when recording an instrument (or instruments) with multiple microphones. It is caused by the

relatively slow speed of sound that allows the same audio signal to be received by each mike at slightly different times depending on the

distance of each from the sound source, surrounding walls etc. When these tracks are subsequently mixed, problems often occur. Some

frequencies cancel each other out and the audio loses punch resulting in a poor recording. This phenomenon is always present in varying

degrees and it cannot be fixed physically. So the first step is to acknowledge the problem and then find a way to fix it.

The solution is to delay each of the recorded tracks by a certain number of samples and most engineers do this manually. However it is not

uncommon to have delays of around 500 samples between microphones so even with just 4 microphones this gives us more than

62,500,000,000 possibilities!

MAutoAlign solves this problem in an extremely efficient way. All you need to do is place MAutoAlign on all tracks that need to be aligned,

start playback and press the Analyze button in one of them. The plugin will then analyze all tracks and determine the correct delay for

each track after just a few seconds. MAutoAlign does not alter the tracks in any way, it only delays them and inverts the phase if necessary.

Groups

When multiple instruments are recorded, drums and guitars for example, it's unlikely that any cancellations between the drum and guitar

tracks will occur as they essentially contain completely different audio. In fact, trying to fix such a group of tracks would probably do more

harm than good. In this case all that is needed is to group the different types of tracks.

For example, if 8 microphones have been used for drums, and 2 for the lead guitar, group D could be set for all 8 MAutoAlign instances in

the drum tracks and group G for both guitar tracks. Pressing Analyse in any of the drum tracks, will cause all 8 to be analysed, while the

guitar track settings will remain unchanged. Pressing Analyse in either guitar track will analyze just those two.

Spectral phase compensation system

Since version 11.02 MAutoAlign features most likely the world's first spectral phase compensation system. The delay and phase inversion

described above technically do nothing to the actual audio, so they are completely transparent, but they also have very limited power. In a

perfect world, where audio instruments would be microscopic points in space, microphones would record perfect audio without any phase

shift and no ambience, this would be fine. Unfortunately that's not the case and the reality is that whatever you do, each track will have the

phase changed in some way. In practice this means that when you mix multiple signals, some frequencies will combine satisfactorily, others

will cancel each other out making the output sound thin and, well, ugly. And although some people try to fix that problem using allpass

filters, it's an almost impossible job. MAutoAlign can now solve that in a matter of seconds.

As part of the analysis, MAutoAlign calculates the optimal phase adjustment to minimize cancellations. You can then simply enable the

Spectral phase compensation module and it will apply the phase adjustment to the input signals. It is disabled by default as it induces

latency (hence it cannot be used live) and it may not always work.

The spectral phase compensation works when there is a stable phase difference. Hence it mostly works when there is not too much noise or

ambience, ideally for close mics. Ambience and noise are very unpredictable signals with no stability whatsoever, which makes the plugin try

to come up with at least something, but the results are usually not helpful. If that's the case, try setting up a longer analysis length, which

can make the noise and ambience cancel itself out in time making the useful signal more pronounced.

Spectral phase compensation system for mixing dry & wet signals

Imagine that you take some signal, let it be a piano, and process it using some equalizer or analog device for instance. This processing most

likely has caused some phase shifting to the signal. Now you cannot really mix the processed version with the original anymore, because

some frequencies would just cancel each other out and results would be awful, or at least not exactly ideal. The spectral phase

compensation system can once again fix this for you - it will analyze the phase difference between the 2 signals and try to either revert the

phase alteration in the processed signal, or cause a similar phase alteration in the dry signal. Either way it will hopefully minimize phase

cancellation.

This also means, that for the first time you can now equalize the tracks before aligning them and MAutoAlign will not only fix the time

differences between the tracks, but also correct the phases of each track, whether it was caused by the processing, the microphone, or

anything else on the way.

Where to place MAutoAlign in the effect chain?

MAutoAlign should be placed in the insert effects chain of your host and if you don't use any plugins causing latency, then it is only a matter

of personal preference. Making MAutoAlign the first item in any chain will usually result in a more successful analysis as this will likely be

free of other effects and be the most natural input. Making it the last item lets it fix the correct the phase alterations caused by any

processors before it, such as equalizers or delays.

Problems may arise when you use latency-inducing plugins. The plugin uses the host's timestamps to synchronize all instances,

unfortunately many hosts are rather problematic in that aspect. If you exhibit erratic behaviour, where each analysis produces in different

results despite analyzing the same portion of the audio, try disabling all latency-inducing plugins temporarily. And let your host's developer

know about the problem.

How to group tracks of an acoustic drum kit?

Acoustic drums are typically recorded using several close microphones, together with overheads and room microphones. Let's start with the

"close mics".

The question is, should you group all close microphones together? There is no definitive answer, but it is customary to try it this way first. If

it doesn't provide satisfactory results, which is often the case if multiple drums are recorded using multiple microphones, you should try

grouping the individual drum kit pieces together. In most cases, the original setting with all close mics grouped together works just fine.

Although the close mics are placed very close to the individual drums, they will often capture the sound of other drums as well. This so-

called bleed usually doesn't need to be handled specifically, unless it is too loud. Drums recorded with multiple microphones, e.g. snare top

and snare bottom, should always be aligned together.

Make sure that you use a reasonable part of the recording for analysis - and that all microphones are actually capturing the performance. If

some of the tracks are silent, it is unlikely these tracks will be aligned correctly. Be especially careful when you use MAutoAlign as the last

item in the chain for each track and you also use a gate before it. By definition, the gate will be cutting out some parts of the track.

Produkt Specifikationer

Mærke:	MeldaProduction
Kategori:	Audio Software
Model:	MAutoAlign

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