You can get a lot of sounds from the small number of knobs, from very noisy to something that could carry a tune.
It's possible to play a mostly-accurate tune on the keyboard with some practice, or have fun sliding or wiggling your finger around.
It's more fun if you have on hand some miniplug patch cables (and maybe miniplug-to-1/4" adapters?), so you can plug other stuff into it. (Might be nice if the library could include something like that.)
The headphone jack has a pretty annoying hiss.