The fix for my noise problem! I'm on an M1 Mac Mini, Venture 13.2.1 with JBL 305P studio monitors (killer monitors BTW) connected via a UA Volt 176 interface / DAC. I had a faint but constant and annoying electronic/buzzy/pulsing sound in the left channel. I tried swopping speakers and it was still in the left so it isn't a speaker issue. I tried a few of the suggestions given here like quitting all apps, etc to no avail. Then I plugged headphones straight in to the Mini and there is no noise. Hmmm. So it's not the speaker but it's also likely not the computer sound as the noise isn't there in the headphones on either channel. Then it hits me. My Orbi wifi extender is standing about 18 inches away from the back of the left channel JBL. I unplug the Orbi and problem instantly gone! So relieved. I know this probably isn't the issue with most of you all but I hope this helps someone else. Depending on your situation, consider outside sources for potential noise generation.