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The process here is quite simple - all I had to do was identify the parts involved. 

Besides the obvious Argon development kit, I understood I needed a microphone, and part to actually switch the circuit on and off. I decided to use a servo for the latter, which is easy to connect and code. Finally, I used a simple tactile push-button to set the system ON or OFF. 

Initially, the servo kept going off as the sound threshold was too low. So I then updated the code to only detect sounds above a high value of 3000.  

Because the switch only activates in two directions, it made sense to turn the servo from 0 to 180 degree - essentially ON & OFF.  

The code for the entire project can be viewed below

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