Okay so I covered some troubleshooting steps last night. Started by just playing the FM3 via my headphones so only headphones were connected. I experienced no issues. Then I plugged in my audio cable (PC to FM3) which goes in OUTPUT 2L & 2R; signal remained fine. Then I plugged in the USB cable; signal was fine for around 10 - 15 minutes and the weird noise started happening again across any type of tone. Turned off the FM3 for a bit, came back and tried the USB and audio cable to my macbook, and played without any issues for awhile. I didn't experience any issues with that combo. Tonight I will try all these steps with my Headrush monitor and new USB cable that Im receiving today. But Im starting to think there is an issue with that specific USB cable and my PC because when I hooked up my Kemper Stage to PC via that same USB cable, my PC would become unresponsive after a short amount of time (keyboard would not work, mouse could move cursor, but couldn't actually click anything). Any ideas on what could be causing the breakdown between my PC and that specific USB cable? At least tonight I will be able to test a new USB cable with the PC and if it works, then I will know it's the other faulty USB cable, but if it doesn't work, then there's something weird going on between my PC and USB, which I find hard to believe because I use my PC and mouse everyday via USB without issue. Look forward to hearing more experienced opinions.