It has come to my attention after looking into buying a used Z Canvas that there is coil whine whilst slowly using the ntrig digitizer, AFAIK its the only time that the coil whine is happening. Here is the test. Now why would that be, Iv got multiple devices with different stylus technology and I never hear any sound when im painting/drawing/note taking. At the 50/57 second marks, especially the 57 second mark its extremely loud the coal whine it is, very loud indeed. Hey could some owners chime in on coil whine and if they have noticed any on there machines.