Chorus - Pure Data Part 1 *Updated*

Whilst it isn't necessary flavour of the month, chorus audio effects have been used across some epic guitar licks since their invention. The way that the original audio signal is processed to create the movement and swirl of a chorus-y tone is quite easy to reproduce using simple audio editing software such as Pure Data.

Pure Data is a real-time graphical dataflow programming environment for audio, video, and graphical processing. For users like myself, it enables you to create musical effects without too much stress. You can download this free to use software here: puredata.info/downloads

Chorus effects are created using delay. A simple chorus effect uses a delay time of 10-40 milliseconds (ms), which is then modulated using a low frequency oscillator. When this signal is summed with the original unprocessed signal, the effect created is chorus.

Below is an example Pure Data patch for a chorus effect. Try copying this example patch and play with the LFO rate and depth and the delay time and amount to get some different chorus sounds.

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