Recently acquired a very good condition used BSX Allegro 4 string bass. It's a really nice bass, well made, good quality ebony board (which I had dressed) and nice pre-amp and controls. The thing I didn't like, which I think is rather common for EUBs, is that it had TOO MUCH SUSTAIN. Years ago I wouldn't have thought there was such a thing, which is why I probably always put Spiros on my DB. But too much sustain makes this sound less like a DB with its characteristic 'Thump' and more like a bass guitar. Not the sound I'm going for. I tried a couple different orchestra strings to see if the damping would do what I wanted - it made sense and I was hopeful but ended up not at all happy with the result - they just sounded dead. I know another approach is to use foam - I know some people put foam under the strings of their bass guitar near the bridge in order to mimic a double bass. My first attempt produced too much damping, but I think my latest effort might be just right. I used a piece of soft-squishable foam like you would use to make chair pads. I cut it to the shape of the bridge and cut 1/2 inch notches for each of the strings. I have included a picture as well as a link to a youtube comparing the bass with and without the foam. I haven't had it on a gig yet but in the practice room it's very promising.