We made a push last summer to add more demos for some of the algorithms. We did add a bunch of new demos but there still are a lot of holes. If you have a second and wouldn't mind letting us know which demos you found lacking, we could put those on our TODO list.
With regards to presets, with a lot of our original batch of audio demos we didn't have any information about what preset was used to create them, but with more recent audio demos we have been keeping track of that. On that algorithm pages on our website it does show the preset names of samples where we know the preset name:
We need to make that information available in the app as well.