I made a recording of this sound that started a few weeks ago in my 2010 V6 Cayenne. It is difficult to hear it outside of the cabin, so I recorded how it sounds in the interior next to the transmission tunnel. I would describe it as a ringing or chirping sound that increases in frequency with engine RPM.

https://www.youtube.com/watch?v=HiV6...ature=youtu.be

Ideas to what this sound is?