That's simply changing an EQ setting, if the voices are not there or different, it effects the way they saounds with or without EQ.
I have a midi file of the nora Jones hit, when played through my Tyros is played fine, but then I happened to play it on my Roland MC-80 and it went from a great sounding midi file playback to an almost actuall live performance, I doubt that EQing could get that to happen.
But if it could I need the biggest eq for my performances.
someone mentioned the EQ setting could not be stored? So if I change the settings to live/club, it will revert back when? everytime the keyboard is powered up or every midi file is played?