I built a quad 8 Track player that uses a mix of retro and modern parts. In this video you can see a demo of the finished unit, as well as a rundown of the build process and hardware/software used.

Do you like audio components with blue backlit VU meters? This unit has four of them! Learn how the meters and other parts from three old eight track players were combined with modern parts including an eight channel audio card and the Raspberry Pi to make this advanced device.

Some items mentioned in this video: (This video is not sponsored and these are not affiliate links)

Behringer UMC404HD USB Audio Interface: https://www.behringer.com/product.htm...
Robertsonics Tsunami 8 ch audio card: https://www.robertsonics.com/tsunami
VU Meter Driver Board: https://www.amazon.com/dp/B0B5F9FKP7 (newer version)
Tiny QR Code Reader: https://usefulsensors.com/#products
balenaCloud for Pi container management: https://www.balena.io/