close to the tone of an acoustic Standup bass ?
I see that you're not really expecting the make a p-bass sound just like a double bass. You're asking if a pedal could make your p-pass sound "close" to a double bass. So, the real question is "how close is close"?
I agree that with composite object modeling you should be able to get part-way to an acoustic sound.
But, there are so many differences between the slab and doghouse. For example, There are body resonances, string variations (the type of strings make a lot more difference on an acoustic bass than on a bass guitar) and how the act of pulling a note from the string effects the tone. I think it would be a modeler's nightmare (or dream!).
Having said that, for a person who has never really
listened to a double bass, then I can imagine that you could get a "double bass like sound" from a pedal. But, I would be really surprised if someone who is familiar with the sound of a real double bass would be fooled. Think of the "acoustic guitar like sound" that some synthesizers (and pedals) generate from an electric guitar - not too great, eh?! Oh, and you don't get to fool around with the bow!
I suggest that you give the double bass a try. It's really much more fun (and, beware, addictive

) than I could possibly describe using the written word.
