The hardware HG-2 concludes its signal flow with the Air circuit – a 10kHz shelving boost for adding high-end sheen and, well, air, activated by a button on the front panel. The plugin version has the same button, of course, but also brings the internal trim control out into the open, enabling easy adjustment of the amount of boost applied.
Completely exclusive to the software HG-2, however, is the Calibrate menu, offering three settings: Dark, Normal and Bright. The choice made here (Normal being the default) affects the high frequency response of the whole plugin, with Dark tilting things towards the low end and Bright emphasising the highs. The differences between them aren’t anywhere near as profound as the variations brought into play by the three Saturation modes, but Dark and Bright are certainly useful options to have when dealing with mixes and sounds that just need a little push in either direction.