People know how e.g. a lowpass filter sounds and how a variation of its frequency affects the sound. There is no need to demonstrate those common things.
The sound snippets therefore focus on the functions which are not so common. Sometimes, it is just a modification of a small detail. The aim was to make the effect as clearly as possible. Therefore, the sound demos are kept dry, so that the user will not be taken off by accessories.
A detailed explanation of the sound demos can be found in the manual:
To reproduce the sound demos, a MIDI file and the appropriate AnaMark presets are provided.