I got a Sting signature bass. Buying one was not on my To-Do List, but Mars Music was going out-of-business and the price was too good to pass up. It sounds good and all, but the low end leaves much to be desired. The note is there, but there just isn't enough tone, no depth, no bass. It has one of those skinny little pick-ups I usually see only on guitars. Could this be the problem? Are there replacement pickups of the same shape/design made for bass? Thanks.