It is an antique and it was never perfectly in tune. Most of the hammers were missing. The instrument is constructed from samples of plucking and tapping the crusty old instrument. There are 3 voices for plucked, struck, and muted, with a fourth voice that has a soft attack and a bit of reverb to act as another accompaniment. The samples aren’t perfectly in tune and the voices can be mixed however you want, resulting in a subtly dissonant effect.
The sample library works with the free Decent Sampler player plugin. Download it here.