jackoj wrote: .. the only true way to hear styles, sounds etc. are to load them into the keyboard
.. but to stay in soundquality near arrangerkeyboards like Yamaha (AWM, XG) or Korg and if you are familiar in creating soundfont-banks with good samples, you can use Sf-players (like xmplay) or sequencer-sw (vanBasco, Cubase, Cakewalk etc) in connexion with CoolsoftVirtualMidiSynth (Midi-driver for rendering without Audigy- or EMU-soundcard) without need to connect your PC/Laptop with your keyboard.
Preferring sequencer-sw it is also possible to send Midi-events of smf to your keyboard for exactly sounding as played with internal sequenzer (but without the need to load each midi-/karaokefile).