RickMakes

https://youtu.be/AHrPJB8K65w

Audio-Technica AT-LP120-USB: https://amzn.to/2VKBjsF (Amazon Affiliate)

Raspberry Pi Raspbian Buster Desktop Initial Setup: https://youtu.be/iWDDXIHyMhg

Raspberry Pi (Amazon Affiliate)
US: https://amzn.to/2LpyVob
UK: https://amzn.to/2Z2inKX
CA: https://amzn.to/2y5yAUA
ES: https://amzn.to/3fSDhSS
FR: https://amzn.to/2LpurxT
IT: https://amzn.to/2T2VZNu
DE: https://amzn.to/3buHRmQ
IN: https://amzn.to/2B3PGTN

List Audio Devices

 aplay -L

Send input to output

 alsaloop -t 500000 -C hw:CARD=CODEC,DEV=0 -P hw:CARD=ALSA,DEV=1

On October 8th 2020, I tested the above line and it didn’t work with the current version of Raspberry Pi OS on a Raspberry Pi 4. You can try the following:

 alsaloop -t 500000 -C hw:CARD=CODEC,DEV=0 -P default:CARD=b1