17 different 'instruments' sampled from the Roland TB-303 analog synthesizer.
This synthesizer is used a lot in 'modern' dance music / techno mostly for
bass-lines and arpeggiators. The 'typical' TB-303 sound has a closing filter
with plenty of resonance.
This project is worked on by volunteers in their free time. Donations are used to cover the hosting costs of the website and accelerate the development of new features. There are many ways to contribute besides donating money, see this page