Loading a preset takes a while with many of the instruments, even from SSD, as you'd expect, given their scale. The presets are listed in the bottom pane, and with over 500 included, most of them come in related sets, so 'Rhodes - Classic Amp' is followed by 'Rhodes - Classic Amp Warm Blues', 'Rhodes - Classic Amp Clean Dry', etc. The browser lets you select from the ten top-level instrument types in the top pane (Acoustic Pianos, Clavinets, Electric Pianos, etc), or head straight to one of the 36 specific models in the dropdown menu below.
KEYSCAPE UPDATES PATCH
Keyscape's interface is clean and straightforward: patch browser on the left big picture of the loaded keyboard in the middle (sadly not mouse-playable) tabbed sound editing, Settings and Info (revealing the history of the current keyboard) section at the bottom and Utility and System menus at the top. All that's required to do this is the latest version of Omnisphere 2, which makes Keyscape's presets available in its browser and loads them in as layers, complete with all their controls. However, Omnisphere 2 owners can actually load Keyscape presets into said synth, bringing its arsenal of sound-shaping and processing weaponry to bear on Keyscape's vintage tones.
While Omnisphere gives you an expansive range of editable parameters and synthesis engines to delve into, Keyscape is all about the sampled instruments themselves, rather than the comprehensive tweaking of them.