Time for my semi-annual query of the URB sages. I play a student model Kohr laminate ("Bertha"). It's been a great bass for my purposes; nice enough tone, easy enough to play without getting tendinitis; sturdy enough to be hauled around without injury to the bass. Have had it 2-1/2 years, no cracks or anything coming unglued. It's an incredibly resonant bass. If it's in a room with any other music/noise, such as horn players in a jazz band or a bar with the jukebox going, you can feel it vibrating like it's about to explode. It just wants to sing along. I play it in a blues/jam band at a bar with a house PA in which I play mostly EBG, but the first set we try to do a bit more acoustic and I use Bertha for that. Getting her properly amplified in this setting has been an ongoing challenge. I have a Fishman pickup on the bridge and plug her into a Fishman Pro Platinum preamp going right into the house PA. We've tried using my Gallien-Krueger 1001RB-II amp and 210RBH cab with it onstage, but it works better just to use the monitors from the house sound. She sounds just fine with an acoustic guitar, but add drums and an electric guitar with 13 pedals (I'm not joking) and it is quite a challenge to get enough sound out of her to be heard, especially onstage, without getting feedback. The singer/acoustic guitar player suggested that I put some kind of acoustic dampening material inside the bass (along the lines of a couple dozen rolls of Ace Wrap) as he has seen bluegrass fiddle players doing that to their fiddles when playing them amplified. Ideally, I should upgrade Bertha's pickup system to something better than the Fishman, plus a mic; but in the meantime, has anyone tried something along the lines of putting something in the bass itself to dampen the vibrations and/or blocking the F-holes similar to the round plastic gizmo that acoustic guitar players put over the sound hole when playing amplified? Many thanks in advance for sharing your knowledge and experience. p.s. If one of the answers is to have the electric guitar player and the drummer back off during the first set, I'll certainly consider that, too.