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The ability to EQ the M&S version of a stereo signal opens up a new range of options and possibilities for processing audio, and can be very helpful in mastering. You can, for instance, EQ the 'M' channel, which is the content that is the same on both channels of the stereo (the sum), separately from the 'S' signal, which is any content that is not equally on both channels (the difference). This makes it possible to process the signal in ways that are not possible with standard LR signals. However, it's also possible to convert conventional stereo signals into M&S format by putting an LR stereo signal through something called an M&S matrix. This makes M&S recording very mono-compatible, and means broadcast audio engineers use it a lot. This means that when you combine the left and right channels to collapse the mix to mono, the figure-of-eight mic gets cancelled out and you're left with the forward-facing cardioid mic. The cardioid 'middle' mic is then sent to both channels in equal amounts, while the figure-of-eight or 'side' mic is also routed at equal levels to each channel, but with its polarity reversed in the right-hand channel. It can be used as a stereo recording technique by setting up a forward-facing mono cardioid mic and a side-facing figure-of-eight mic.
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M&S stands for Middle & Sides, and is otherwise known as Sum & Difference. The most interesting feature of this plug-in is the option to EQ using M&S techniques. The TDM versions offer some additional functions, such as insert slots in the Scope version and extensive support for Digidesign's Icon control surface.
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BX Digital is available in RTAS and VST native formats, and also as a TDM plug-in for Pro Tools and Creamware Scope systems.
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Now they've taken their BX1 Modus EQ and their BX2 Image Shifter/De-esser, and combined them to produce what they describe as an 'enhanced digital emulation' in one plug-in. Brainworx's new plug-in combines an innovative M&S matrix with mastering-quality EQ and processing.īrainworx are a German company who started out making hardware mastering processors. DR readings of less than 8dB runs the risk of sounding squashed.Middle & Sides processing offers unique mastering possibilities, such as the ability to de-ess a centrally panned vocal without affecting panned cymbal sounds. Generally speaking, anything with an overall reading of DR12 or more will sound very dynamic. Louder material often has less dynamic range than this. Very dynamic material will often read DR14 or more. Heavily compressed music will often read DR6 or lower. Peak level, loudness and Dynamic Range (DR) are all measured in dB. The closer the RMS level gets to the peak level (usually close to 0 dBFS), the more compressed and limited the music is likely to be, and the smaller the DR measurement gets.
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This measurement is extremely useful because it gives an intuitive idea of how squashed the music is. The DR value measures the “crest factor” of the music - the difference between the peak and RMS levels. In this free video tutorial, Pro Tools Expert Team Member Julian Rodgers looks at the bx_meter plugin from Plugin Alliance, a comprehensive metering plugin offering Peak, RMS, Balance, Correlation and most interestingly dynamic range metering (DR).