How could I get Sonar Pro to recognize my synth?

Hi, when I load up a midi track, and plug my midi from my synth to my audio interface, I have a midi connection it's just that in Sonar Pro it plays like some kind of default piano.  I thought it could be a way that it plays your hardware synth sounds, what do I need to setup to get it to do that?
 
 
Thanks,
 
LWD

so its not synchronous? 

OK I am confused, and I think I am not the only one. If you have a MIDI connection to your audio interface, it is not an audio connection but a MIDI interface built into your audio interface. I think what you are trying to do is to play a MIDI track in SONAR to control the output in your external hardware synth (since softsynths have no physical MIDI connections). If that is the case, and you are hearing any output from your external synth (and it would be helpful to learn where that sound output is entering the atmosphere from), then the problem is to get your hardware synth to interpret the MIDI input coming from SONAR on channel X to be playing the instrument you want to hear on your synth. Typically that requires settings in the synth either physically or by transmitting MIDI patch or other messages.
 
But before going much further, realize that asking a meaningful question generally requires far more work than answering one. Take the thirty or forty minutes needed to trace and write down exactly what physical equipment you are using, how it is physically connected, and how your SONAR internal routing is set up, exactly what you are trying to do with what make and model of equipment, in such way that someone who has no idea what you are talking about will understand, and then post it here. Often just doing that exercise will clarify the problem for you. 

Thanks for the input you all, 
 
Cactus music, I do believe that it is sending out a wavetable piano.  How do I get it not to send out the wavetable piano, and possibly recognize my synth as a sound module of some sort, hope that wasn't too vague... thanks
 
LWD