I'm looking for some flats that don't have the sustain and high end that most people are looking for in flats. I don't necessarily want them to sound really dead, just more like the attack and smoothness you'd get with an upright bass. Kind of a subdued sustain. So far I've tried LaBella nylon tape wounds, TI Jazz Flats, Sadowsky flats and GHS nylon tape wounds (my favorite so far), but they all seem to have the normal bass guitar attack/sustain envelope. Granted, it's a semi-acoustic chambered solid body, so I probably won't be able to get too far away from that, but I'd like to try for the faster decay of an upright bass and less bass guitar twang. Any suggestions?