Mains => Feedback.

[tdbmkegirsk11]

Sorry, absolute beginner here w Presonus gear. 50 years with music performance but just a few hours with Presonus.
.
I got the Quantum and Studio One working enough that I can record and play back in headphones.
When I try to play back thru the mains (monitors) I get howling feedback. Clearly even though I'm not recording, the mics are hot.
How do I tell it to shut off microphone inputs so I can listen in the room?
There must be an option or switch or something?
.
Also greetings to all you enthusiasts out there.

 

[Stuart Welwood]

It's probably because the mic tracks have their monitor buttons on. Click on the bright blue speaker button.

Welcome to a marvelous journey. I was where you are a year ago.

 

[tdbmkegirsk11]

Ah! The old smaller Presonus 96 interface controls it with a physical knob ...

I just had to turn it full clockwise when playing monitors in the room.