I am using Vmix V20 for boradcasting live video to my youtube channel, the video is coming from canon camera with lightwave USB Grabber and the audio comming directly from (record out) port from yamaha 5016 power mixer. the problem is when i just run Vmix a noise come with the audio . there is no noise when I listen direcly to the sound from the computer. i tried to use another PC with no luck. i tried to use intermediate Zoom1 Audio recorder between the mixer and the PC also with no luck . i tried to use xsplit live stream software also same noise coming. one sample of the nois is here

I have had this issue many times, and most of the time it was coming from a laptop ...as soon as I unplug the laptop, the noise stopped....I then used a DI box and passed the audio from the laptop through it...other times, I had to change audio cables that are not wired the same.....especially home made cables....I would disconnect everything from the PC, and reconnect them one at a time to see which cable or device is causing the noise, and replace it, or in one case I had to use a ground lift adapter on a power cable....but those noises can be very disturbing...