*sigh*
Okay, so right now what you're doing is taking the MIDI signal from your synth - that is, using your synth as nothing more than a MIDI controller, (as we suggested you do initially, I might add) - and you're playing it back using General MIDI sounds found on every soundcard at more or less the same uniformly unimpressive quality. And you're expecting it to sound good.
So now you have two options. If you want to hear your synth's onboard sounds playing the MIDI daya, you need to re-route the MIDI signal to go
back out to the synth. Then, you need audio cables to connect from your synth to your soundcard's Line-In port (assuming it has one). Then, in the same instance of Cubase, you'll need to create an audio track and have it record what's coming in from Line-In.
Alternately, you could have listened to us and saved money by buying a simple MIDI controller and some sound libraries, in which case you would only need to tell Cubase to play the MIDI data using said sound libraries - no extra cables, no hassle. And almost any sound library you can buy these days has much higher-quality sounds than a synth does, for the fairly obvious reason that a synth isn't really trying for realism, just versatility. Hence "synth."
Actually, come to think of it, you've only really got the first option unless you plan on doing some trading back (hope you kept that gift receipt...)
So....good luck with that.
