I just made several tests with the Engraver with different speeds and power settings. If i try i treshold of 100%, almost everything is black (not in preview). I engraved on some cork pieces. You can see, that the intense of the laser is changing while it tries to make the gray zones. But even if i go back to 10% power, the laser is to strong for cork. Even with very high speeds. So is the power setting functional?