I know that it ain't tech support forum, but maybe someone here knows the symptoms.
When i connect my Denon MC6000mk2 controller to laptop and my home hi-fi (oldschool Philips amp) some strange buzzing sounds comes up,
even though Denon's lineout is not connected yet to the amp.. just by usb cable to the laptop, and the sound comes from the laptop's headphones jack to the amp's line in (that sound appears only when controller gets connected to laptop by usb). Amp works fine with other devices, so it's not it. When i change the cables and connect Denon's lineout to the amp, that weird sound is still there, i can play some tracks from VirtualDj software etc but whenever i hit stop all i can hear is quiet but annoying buzzing high pitched sound in the background. What is this sh**? : P