I'm running the following setup & I can't seem to eliminate the hiss in my vocals. The quality of the vocals themselves sounds great, but there is always a hiss there nonetheless: M-Audio Sputnik Microphone -> Presonus BlueTube DP Pre-Amp -> M-Audio Firewire 1814 I/O -> Garageband on a MacBook. I have Monster cables connecting all the links above & the cables and equipment are all less than 6 months old & in tip top shape. After reading some of the articles around I have a feeling it has something to do with mismatched gain signals. Any advice is truly appreciated.