FrankJVC

https://www.youtube.com/watch?v=B3y2mUq0G-A

You need to install Soundflower: https://rogueamoeba.com/freebies/soundflower/ In the  QuickTime  Player window, click the down arrow to the right of the record button and select "Soundflower (2ch)" as your input. Then launch System Preferences and go to the  Sound  settings. Go to the Output tab and select the same "Soundflower (2ch)" option as you did in  QuickTime  Player. You can download it from here: https://github.com/mattingalls/Soundflower/releases Here's the direct link: https://github.com/mattingalls/Soundflower/releases/download/2.0b2/Soundflower-2.0b2.dmg

After watching ETA Prime's videos, I found this site. It works like a charm AltStore:  https://altstore.io/ ETA Prime Video:  https://www.youtube.com/watch?v=JZI9OlmqFOE