Hi guys, I have a really annoying problem with my bass strings and was hoping someone could give me some advice. I play in a modern hard rock band, it sounds really heavy and agressive and I tune my 5 string, like the guitar players, in D flat, like this: 5-Bb 4-Db 3-Ab 2-Db 1-Gb It really is necessary for some of the riffs to sound good, plus I started playing bass when I joined the band so I`ve pretty much always played like that, but the thing is, as you can see, the strings are tuned way lower then they`re supposed to. It doesn`t make that much difference in all but the fourth string ( Db ), which is tuned 1 and a half step lower than the usual and stays too loose on the bass and sounds awful. I`ve tried to make up for the tension buying thicker strings of all kinds, but was never fully satisfied, until finally a friend of mine who owns a music store suggested I should put another B string instead of the E, so my fourth and fifth strings were the same thickness. I`ve been told it shouldn`t be a problem and it shouldn`t damage the instrument as long as it`s set up properly, so I gave it a try. My band is currently recording it`s first cd, and through the bass sessions I thought the bass sounded awesome, but when it came to the guitar recording we found out that, in some songs more than others, the bass was horribly out of tune, in some cases almost 1/4 tone off. Now I`ll have to record it all over again, but the real problem is we can`t find what caused it. It was properly tuned before each song ( with the same tuner and frequency used on the guitars ) and it almost didn`t change after, and it wasn´t finger pressure on the frets or bad bends either because there were open string notes out of tune. It never happened before in the studio so we`ve also ruled out gear and virtual problems, so the only thing I can think of is maybe some problem with the new set of strings. It`s a real freaking mystery for us and we`re pretty desperate for some answers, so does anybody know something that could help, know of any other players who use the same thing with the strings, or even have some other advice on the loose string problem? If it matters for anything, my bass is a 5 string active fender american deluxe jazz bass. Thanks.