Mario, that Sonivox upright bass is fine in practice, as well as in demo. More refined than the Manytone Bass. It has slap in the top velocities, but not all the thumps and slides and graunches of the Manytone.
It has been available for years in soundfont form. All the DVI's are the old soundfonts repackaged in little VSTi players. Still really good.