I use DisplayPort to connect a PC to a monitor and I have external (USB) speakers connected to the 3.5mm jack on the monitor. With an RX560 graphics card and the latest Radeon drivers occasionally I hear distorted sound when I watch YouTube videos, videos on the PC, listen to mp3 songs etc. I am using the 18.12.2 drivers. Sound is OK when I connect the speakers directly to the PC. I don't have a second graphics card with a DisplayPort to test, however with a different device connected to the monitor using HDMI sound is OK too. Could this be a driver problem or a hardware problem with the card?