Wow! After reading a lot here about flats vs. rounds, I decided to try some D'Addario Chromes on my Modulus. Playing through Ampeg SVX these sound absolutely amazing! With the FB5 I was getting to where I didn't like the treble or mids up at all. Was just too piercing...maybe? Anywho, with the flats on - I know they're new and will mellow out some - I have the perfect balance of thump, highs, and mids. It just sounds incredible. I had always wondered how/why anyone would want to play with flats as I loved the zing and brightness from a new set of rounds but I have seen the light! My only hang up right now is that they feel kinda sticky. From what I've read this will subside somewhat after awhile of playing them. I would've never in a million years guessed that I would love the sounds of Flats + Modulus.