This was part of a live stream show on DJNTV: John shared how he solved a static problem with his Denon DJ MC7000 DJ Controller. When playing music, after about 1 or 2 songs there would be an increasing static or buzzing sound similar to a speaker distorting but at very low volumes. After testing a variety of possibilities (covered in the video) the problem was pinpointed and fixed with a firmware update.

Here is the controller:

Here is the case:

Here is the built proof Denon DJ Mc6000 MK2:

Here is the gaff tape used to support the MC6000 MK2:

How To Save The Day And Your @DenonDJ MC7000 DJ Controller Virtual DJ @VirtualDJ | Disc Jockey News