Computer Music

> Step by step

1. Building a melody as a jumping-off point for a beat

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1 For this tutorial, you will need to use a step sequencer. Here’s Auxy, a free app for iOS devices. You can use whatever software you are familiar with. Open up a fresh project and set it to loop every four beats. If you can, set the key signature to C minor or C pentatonic minor, if available.

2 For this demonstrat­ion, we’ll use a random melody, so place six to eight notes at random. However, in order to ensure you feel the pulse in the right place, add a note or even two right at the beginning.

3 Hit play. At first, the notes probably don’t sound like music – they’re just noise. After a moment, your brain synchronis­es to the rhythm and you start to feel the pulse. At this point, the notes start to sound like music. Also note that the pulse isn’t actually being played: it’s only felt.

4 Next, open up a drum track and input a bass drum on the quarter-note pulse. This should play the pulse that you are already feeling. However, if you feel the pulse in a different place, then this pulse will feel jarring until your brain re-synchronis­es. This can take a moment. You might also feel the bass drum pulse as upbeat eighth-notes.

5 The length of notes changes their meaning. It’s easy to only think about the onset of a note, but the ending of a note drives its feel as well. For example, if you wanted to use only notes on a quarter-note pulse but still create a feeling of an eighth-note pulse, just make the notes an eighth-note long. To create a triplet feel, make them a triplet or two in length.

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