D. Smolkens double bass (SFZ version) is a free sample pack by Karoryfer. Avalaible audio files format(s): sfz.
Samples of an acoustic double bass, bowed, plucked plus various noises. Arco is 5 velocity layers with 2 round robins, pizz is 3 velocity layers with 3-4 round robins and noises have no velocity layers and sometimes have round robins.
https://soundcloud.com/karoryfersamples/double-bass-demo-with-superfake-effect
http://www.karoryfer.com/karoryfer-samples