OK, so...I play a lot of ABG, and it's all unplugged. mostly with an oldtime string band, also some blues stuff. the guitar is a Martin B-1. here's the deal...I've been hearing that you can get a sound more like an upright out of the Rotosound Trubass black nylons. I also see they're a very low tension. I ordered a set, and went with the 5-string set, whci runs .065-.135. My thinking is that if the tension is all that low, I can put the 4 biggest striings on, making it a 4 string set that runs from .075 to .135, getting more mass, more thump, and I'd think more volume. what do you all think? will this give better sound and more volume than the bronze round wound set I play? will it damage the guitar? I can't find any tension numbers.