The zynth doesn’t really sample. It can record chunks of audio it processes and if you have an audio in facility of some kind ( Audio card or USB) you can grab audio recordings in a very simple way.
Once you have a chunk of audio you can use software like Polyphone to make sf2 files and the like that the Zynth will play.
The full list of features is down to the Engine that a user chooses to use. With the LV2 PureData, and CSound engine options pretty much everything is out there . . .
The zynth is as, as has been said, a Swiss army knife of audio !!
That’s certainly part of the attraction but it’s also a lot less battery hungry which makes local batteries viable.