I hear quiet high pitched sound interference coming from Cubase after playback. It´s quite annoying. When I close Cubase, the sound goes away. When I open Cubase, it´s silent, but when I push play and stop, the sound appears. When I play music from iTunes and stop playback the background is dead silent. I use Apogee Duet 2 and Symphony. It happens with both interfaces. Cubase is 6.5.4. Tried in Mountain Lion and Snow Leopard, happens in both.
What could cause this interference sound? Is this a Cubase problem? Interface problem?