SWAM Double Bass

This, along with the others in the SWAM series, is probably the most accurate emulation of the physical instrument, double bass in this case, available on the market. The overall tone is very convincing and it has numerous articulation controls (dynamic, bow/pizz. position, bow pressure, vibrato, tremolo styles, harmonics and others) to make it indistinguishable from the real thing. And it is quite light on the CPU. Running ~10 instances with full automation is no problem and I have a laptop.

The thing is pricey but is worth every penny.