On a slightly different amp gain issue. I have a DX200 with an AMP1 MK2. Have not been able to successfully select the 'high' gain setting on any of the firmware I've tried. The DX200 standard firmware did not work (from memory it only had two settings available, not three), using the DX220 ported Fidelizer software (13.1) the three gain selections show up but only 'low' and 'medium' settings work - when I select the 'high' setting it either changes to medium or low (depending on what you are changing the setting from). An interesting quirk, not a huge deal as I really only need to use low and medium, but it would be good if high worked as well.