I have just been getting used to my new Behringer Truths monitors and have been really please with them so far. However they emit an annoying screeching sound that you can only hear when play is stopped. This screech changes in pitch/tone whenever the midi transmitter is active! :sad: I have tried unplugging my MT4 midi transmitter and then the sound stops. THough I can't do much without my transmitter plugged in! This was never an issue with my previous monitors and still isn't as I've tried to hear it through them, and I've never heard it in headphones. :? And yet it's difficult to find fault of either the monitors or the transmitter if they both work perfectly and silently in isolation. All help or advice appreciated. Fank u merry dutch!