MeldaProduction MAutoAlign Bedienungsanleitung
MeldaProduction
Audiosoftware
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 in one of them. The plugin will then analyze all tracks and determine the correct delay forAnalyze button
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 could be set for all 8 MAutoAlign instances inD
the drum tracks and group for both guitar tracks. Pressing Analyse in any of the drum tracks, will cause all 8 to be analysed, while theG
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.
Overheads are also quite close to the drum kit, but they capture lots of ambience too. Experience tells us that this ambience usually makes
aligning pointless, however you should try anyway. Sometimes overhead microphones are placed some distance from each other. In this
case it may be necessary to align them with each other as there may be phase collision between them and alignment would improve the
stereo image.
You can also try aligning the overheads with the close mics. Your first step is to listen to discover if they are actually colliding with the close
microphones. If so, first mix all the close microphones into a bus (group) track, let's call it "closedrums" and then align the overheads with
that track. This grouping is done because aligning overheads with the separate close microphones, can confuse the analysis as the phasing
problems are minimal and the overheads contain too much ambience. So it is usually better to work with the close microphones together,
after all these are the key for a tight mix, overheads only fill the gaps, glue it together and provide some natural ambience.
Room microphones are usually placed some distance away from the whole performance and as the name suggests, are there to capture the
room. With that much ambience it is difficult to find and fix phasing issues, but it is often worth trying. As with the overheads, you may use
MAutoAlign to fix phasing issues between multiple room microphones if they have been placed far enough away from each other. The good
news is that ambience in a way fights phase cancellations, so in most cases there actually isn't any problem in the first place.
Presets
Presets button shows a window with all available presets. A preset can be loaded from the preset window by double-clicking on it, selecting
via the buttons or by using your keyboard. You can also manage the directory structure, store new presets, replace existing ones etc.
Presets are global, so a preset saved from one project, can easily be used in another. The arrow buttons next to the preset button can be
used to switch between presets easily.
Holding while pressing the button loads a random preset. There must be some presets for this feature to work of course. Ctrl
Presets can be backed up by 3 different methods:
A) Using "Backup" and "Restore" buttons in each preset window, which produces a single archive of all presets on the computer.
B) Using "Export/Import" buttons, which export a single folder of presets for one plugin.
C) By saving the actual preset files, which are found in the following directories (not recommended):
Windows: C:\Users\{username}\AppData\Roaming\MeldaProduction
Mac OS X: /Library/Application support/MeldaProduction
Files are named based on the name of the plugin like this: "{pluginname}.presets", so for example MAutopan.presets or MDynamics.presets.
If the directory cannot be found on your computer for some reason, you can just search for the particular file.
Please note that prior to version 16 a different format was used and the naming was "{pluginname}presets.xml".
The plugin also supports
an online preset exchange. If the computer is connected to the internet, the plugin connects to our server once a week, submits your
presets and downloads new ones if available. This feature is manually maintained in order to remove generally unusable presets, so it may
take some time before any submitted presets become available. This feature relies on each user so we strongly advise that any submitted
presets be named and organised in the same way as the factory presets, otherwise they will be removed.
Left arrow
Left arrow button loads the previous preset.
Right arrow
Right arrow button loads the next preset.
Panic
Panic button resets the plugin state. You can use it to force the plugin to report latency to the host again and to avoid any audio problems.
For example, some plugins, having a look-ahead feature, report the size of the look-ahead delay as latency, but it is inconvenient to do that
every time the look-ahead changes as it usually causes the playback to stop. After you tweak the latency to the correct value, just click this
button to sync the track in time with the others, minimizing phasing artifacts caused by the look-ahead delay mixing with undelayed audio
signals in your host. It may also be necessary to restart playback in your host.
Another example is if some malfunctioning plugin generates extremely high values for the input of this plugin. A potential filter may start
generating very high values as well and as a result the playback will stop. You can just click this button to reset the plugin and the playback
will start again.
Settings
Settings button shows a menu with additional settings of the plugin. Here is a brief description of the separate items.
Licence manager lets you activate/deactivate the plugins and manage subscriptions. While you can simply drag & drop a licence file onto
the plugin, in some cases there may be a faster way. For instance, you can enter your user account name and password and the plugin will
do all the activating for you.
There are 4 groups of settings, each section has its own detailed help information: enables you to pick the GUI style for theGUI & Style
plug-in and the main colours used for the background, the title bars of the windows and panels, the text and graphs area and the
highlighting (used for enabled buttons, sliders, knobs etc).
Advanced settings configures several processing options for the plug-in.
Produktspezifikationen
| Marke: | MeldaProduction |
| Kategorie: | Audiosoftware |
| Modell: | MAutoAlign |
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