What I'm saying is that your overall sound could be improved by a single preamp in the $1000-$2500 range, and about $4000 in mics, and if you have aspirations to make money doing this, plan your next upgrade to improve your signal. Neither the pres on the Mackie nor the Blue Tube can produce a signal for a critical track that is of commercial quality. The pres on the Mackie are good for a bunch of auxiliary channels for a drum kit, but I wouldn't run a vocal track through it if I had better options.
Don't misunderstand me. You've done a lot of hard work and spent some money already, you're not a newbie, and putting up a website sort of says "Open for Business", so if you have the urge, go for it when you're ready! To go from where you are to semipro level, I think you could benefit from higher end preamps and several thousand dollars worth of good mics, or at least 1 main vocal mic, such as Neumann U87. I know it takes time, 'cause for most of us working stiffs, money takes time. Keep up the good work.-Richie