I've called an Apple Repair Dealer and they believe its a software setting. I've tried various settings in Preferences>Sound>Output including a Multi Output device but do not show any sound output either in the System Preferences or OBS. If I test the sound output is tested using either using a Youtube video, alert sounds or through BlackHole I can see the sound input registered in OBS. I can see the different sound levels in the Preferences>Sound>Input. Here's my setup: 2019 Intel Macbook running OS Sonoma 14.1. Since then I've struggled down a black hole with no success. Due to issues with Facebook feed it was suggested that I update both OBS and Apple OS. I'm the most skilled Mac person but I'll admit the current situation has me pretty frustrated. I've been thrown into the situation of learning OBS for a church.