Im using a microKORG synth through a logitech Z550 speaker setup and i tried it for the first time with my band today, at boost 11 and the key volume at max, it barely does the job and some parts are too soft...its definetly not using all of its 500watts, the 120w guitar amp i was using previous to this was far louder half way up. I believe the output signal from my microKORG is weak. Is there any mixer or something I can use to boost/amplify the signal so itd louder? please help, i dont want to go back to using the guitar amo, this is so much nicer sounding, just needs to be a bit louder...