How to get raspberry pi 4 to read a line-in input from a sound card

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I want my Raspberry pi to read the audio off of my main computer and then make some adafruit neopixel lights that I have connected change brightness in correlation to how loud the audio is. The coding (probably) will not be an issue, but I can not figure out how to get the Raspberry pi to read my sound card with a line-in input correctly. For reference, I am using a raspberry pi 4 and the sound card I am using is a ICUSBAUDIO7D.

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