It will work straight away. Use the settings in Cubase to find the correct midi input & output. You will also have to consult the keyboard manual. If I remember correctly from your previous thread you have a Creative Audigy card. Does your new keyboard have its own speakers? If so, then you have the choice of hearing the sound from either the PC's or keyboard's speakers. Unless you've bought a cheap keyboard, the keyboard's speakers will give you the best sound (especially if you connect them to a hifi or PA). When you mention recording music, do you mean recording the sounds from the speakers (as a wav file) or recording as a midi file? The wav file will use up 10Mb per minute but a typical midi file is about 50Kb for the whole song/tune.