Hello,
 
	With Echo Input on, I get beeps.  I haven't timed them, guessing one every 10 or 20 seconds or so.  Doesn't matter if I'm recording, playback or just idle.  I thought maybe it was coming from my USB mixer so I powered it off; still there.  As soon as Echo Input is off, goes away.
 
	Any ideas?
 
	 
 
	EDIT: About every 30 seconds, pretty regular.