Hi-
The H910 plug-in is meant to be used inside of a DAW (Digital Audio Workstation), for processing audio. When you launch your DAW, you should be able to select the H910 from the plug-in inserts menu. It will pop up with the Rack and Keyboard views showing. The plug-in won't launch when you click presets in the Mac Finder view – rather, you select them from the preset dropdown in the plug-in itself.
Best,
Tom
