Visualizing sound in TouchDesigner

You can follow this tutorial to generate a dynamic sound wave in TouchDesigner starting from a sound file.

Importing your sound file into TouchDesigner

• Open TouchDesigner
• Remove the example network and get a blank view
• Add your sound file: you can do this by directly dragging it inside the software view. It will automatically create a Audio File In named as the original file. Alternatively, you can add a Audio File In CHOP by double clicking on the pane view. You can then select your file from the operator menu.
• Add an Audio Device out and link it to your sound file. In this way you will be able to hear it. A file on its own will not automatically play without it.
• You might have noticed how the program is already giving you a visualisation of the audio file. Add a Audio Spectrum CHOP to display the frequency spectrum of the audio file.
• By default you will see the audio spectrum as a stereo view, visualising the two channels. You can turn this into one by adding a Math CHOP.
  

In the menu you should set:
Combine Channels : Average
This option will merge the two channels into one.