Any signal recorded using an M/S mic technique will need to be decoded before it can be played back, but the ability to turn an L/R signal into M/S temporarily opens up valuable processing opportunities at the mixing and mastering stages - see the 'M/S Applications' box. ![]() After all, it's how your mixes will eventually make their way to the loudspeakers! However, there are quite a few circumstances where it's useful to work with stereo signals in the Mid/Sides format. What Blumlein demonstrated is that a conventional stereo signal can be 'matrixed' into M/S format and back without losing any information.įor most recording and mixing scenarios, conventional L/R stereo is the most useful format. This way of representing stereo is known as Mid/Sides, or sum and difference in some circles. However, as Alan Blumlein showed many years ago, there is an alternative way to represent a stereo signal on two channels, where one channel carries everything that is identical in the left and right channels - the sum of the left and right signals - and the other carries everything that differs between the left and right channels. If you play back a simple stereo file, the left channel will be output from the left speaker and the right from the right speaker. As in most DAWs, stereo signals in Pro Tools are usually represented as separate left and right channels. In this month's workshop we are going to take a look at using Mid/Side processing in Pro Tools. Learn to set up M/S matrixing in Pro Tools and you open up a world of creative processing possibilities.
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