Hey guys. Look I've looked into this before, but I really need to get it sorted now. Aging keys player actively gigging. I currently play through a Roland KC-400. Please don't judge me too harshly. But I'm pretty much too old to pick it up any more. Just too heavy. It's the only make of amp that's loud enough, and my main band is only a wedding band. I read constantly that you all play through powered speakers, which tend to be pretty easy to carry. But here's the thing. I've tried a few (even bought a QSC-10 a couple of years ago) and they're just not loud enough. Must be a weak output from my keys, of which I have three. So then I hear talk of preamps, or mixers, to boost the signal. What's the difference between these? Is one better than the other to boost the signal? Any recommendations? Please help if you can (in very simple words). I need to sort out my final keys setup on this earth. TIA.