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creating the clangourous sounds for which FM synthesis is famous. We'll come back to enharmonic sounds a bit later. The C:M Ratio For now, if you've installed Digital, load it up and let's get down to business. I'm going to be using MeldaProduction's excellent "MAnalyzer" plug-in for frequency analysis. The first thing that we need to do with Digital is set everything to usable values. If Digital has not automatically loaded up a patch bank don't worry too much, we're starting from scratch. Simply click the "Clear" button on the "Programs" tab and we're ready to go. You then need to select the "Alg" tab. "Alg" stands for algorithm, an algorithm being a preset way of connecting up the synth's oscillators. To demonstrate C:M Ratios we're going to whole numbers though we can use The "Alg" tab presents you with 15 decimals too. When the C:M Ratio be using a ConcreteFX synth called algorithms (Figure 2), the one that we consists of whole numbers, say, "Digital" that is available from the want is number 6 (highlighted) - two ConcreteFX website for $37/Euro29/ÂŁ20. 1:2, 3:5, 4:1 the resulting sound is pairs of operators in series. Of the ( harmonic, i.e. pleasant. A ratio of pair we're only going to be bothering 1:2.82 will give an enharmonic with the operators labelled "a" and "b". sound which can be useful for We'll be using Digital because it features specific controls for adjusting C:M Ratios which makes the Figure whole thing easier. If you have an FM synth that does not feature dedicated ratio controls then you'll have to make do with adjusting the relative pitches of the synth's oscillators. It works but it's slightly more complicated, or at least not so intuitive. So, what is a C:M Ratio? It is the ratio of the frequencies of the Carrier and Modulator. Simple, huh? The C:M Ratio is generally expressed in terms of February 2012 05 2

February 2012

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