Let’s say we start with a audio track and we want to use that sound as the audio source for Refractions:
![A screenshot of Logic Pro on macOS showing a single audio track](https://www.decentsamples.com/wp-content/uploads/2024/01/Screenshot-2024-01-09-at-12.59.55 PM-1024x644.png)
Your instinct might be to put Refractions directly on that track. Don’t do this. Instead, create a brand new Software Instrument track:
![](https://www.decentsamples.com/wp-content/uploads/2024/01/Screenshot-2024-01-09-at-1.00.22 PM-edited.png)
The new track will have some new instrument assigned to it (in my case the instrument was Logic’s own Sampler instrument). Click on the instrument to change it:
![](https://www.decentsamples.com/wp-content/uploads/2024/01/Screenshot-2024-01-09-at-1.00.29 PM-edited.png)
You’ll want to select Refractions from the AU MIDI-Controlled Effects sub-menu:
![](https://www.decentsamples.com/wp-content/uploads/2024/01/Screenshot-2024-01-09-at-1.00.40 PM-1024x576.png)
At this point, the Refractions user interface will pop up. Select MIDI Synth from the Pattern list:
![](https://www.decentsamples.com/wp-content/uploads/2024/01/Screenshot-2024-01-09-at-1.00.50 PM-1024x576.png)
Next, in the top-right corner you should see a menu that says Side Chain. Select the audio track containing the audio you want to use as an audio source. In our case, that is a track simply called “Audio”:
![](https://www.decentsamples.com/wp-content/uploads/2024/01/Screenshot-2024-01-09-at-1.00.58 PM-1024x576.png)
That’s it! At this point, all that’s left to do is to write some MIDI on that instrument track. As soon as you hit Play, you should hear sound coming from your speakers:
![](https://www.decentsamples.com/wp-content/uploads/2024/01/Screenshot-2024-01-09-at-1.02.56 PM-1024x576.png)
Enjoy!