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Matching Echo with Tempo
on Tuesday 20 June 2006
by Scott Garrigus author list print the content item {PDF=create pdf file of the content item^plugin:content.32}
in Music Software - Intermediate
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by Scott R. Garrigus

When adding an echo effect to audio or MIDI data, there may be times when you want the echo to be synchronized with the tempo of your song.

To figure out the delay time value that you need to use for the current tempo of your song, simply divide 60,000 (the number of milliseconds in one minute) by the current tempo (measured in beats per minute) of your song. This will give you the correct delay time value to use with your echo effect so that the echoes will be synchronized to the quarter notes in your song. For example, with a tempo of 110, you would use a delay time value of 545 milliseconds for quarter note echoes.

Now what if you wanted to synchronize your echoes to some of the other note values in your song? Well, that's easy too. Just multiply or divide the initial delay time value that you got for quarter notes by 2, and then again by 2 and so on. For example, to find the delay time value for half notes using our initial value of 545, we would just multiply 545 by 2 to get 1,090 milliseconds. This works because half notes are twice as long as quarter notes. To get the delay time value for eighth notes using our initial value of 545, we would just divide 545 by 2 to get 272. This works because eighth notes are half as long as quarter notes. How do ya like them echoes?

Copyright 2000 by Scott R. Garrigus. Reprinted with permission.

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