Dimension Pro

Touch B to open the Synth Rack. Double click the synth itself and in the top of the synth click and select a sound.
 
Ensure your midi track is routed to output into the synth.

The problem seems to be in Dimension Pro and Rapture. All the other sounds I can hear, such as session drummer x64 and SI-Bass Guitar and z3ta+. Not sure what the problem is.

He was saying that you should route the Output from the midi track to go TO the synth.  That means that the midi events for the midi track will drive the sound generation of the synth.
 
The synth then needs to have its output routed to one or more AUDIO tracks.
 
Bob Bone
 

There's two ways to load softsynths:
1) As separate MIDI and Synth tracks. This way you have to right click the output bin in the MIDI track and select Dimension Pro as the output.
2) As a Simple Instrument Track. This way you don't need to set the output, its done automatically. There are some limitations to using Simple Instrument Tracks, but I don't recall what they are. AFAIK, for most things, they work fine.
 
You select the method when you first insert the softsynth. There is a dialog that pops up.

Ok...
Let's try from a new project to try to limit our variables...
 
Create a new project and set it up so that when you play it you can hear the metronome. That way we know you've got it set up properly. To do this, route your audio out from your master bus to your interface and enable the metronome.
 
Next, insert a soft synth. Include the midi track and the output track (see the tutorial if you aren't sure about these instructions). Choose Rapture or Dim Pro. Open the Synth and at the top of the Synth choose a patch (this is through the Synth tab of the browser... double click the Synth... click in the program field at the top and select a program).
 
Now, right click in the midi track and choose piano roll view. Scroll to measure One and add a long note (couple of measures). You may hear it when you double click to add the tone to piano roll view but you may not.
 
Now, ctrl+w to RTZ (return to zero or the beginning of the project).
 
Spacebar to play. You should now hear your single note play.
 
So, next step, configure your input midi device. To do this Click P to open preferences. Click on the tabs and enable your midi devices by check the boxes next to your devices (see starting tutorials for more info here).
 
Click Apply and Close on the preferences.
 
Go to your midi track and select the INPUT for the track at the bottom of the track inspector (click i to show and hide the inspector and ctrl+i to toggle between display modes so you can see the inputs for the track). You can probably just set this to midi omni in.
 
Now, tickle the ivories and see if you don't hear the glorious sounds.

Thanks for the help GS. I followed the steps, starting a new project, etc. Everything was going ok until I got to the step, (spacebar to play, you should now hear your single note play). I didn't, and that's what I've been dealing with. I'm wondering if I need to re-install dimension pro, perhaps something is wrong from that angle. i really appreciate you taking the time to explain and go through the steps...I'll keep at it and will update as soon as I get it working...

Sometimes I find that the standalone versions of the synths tend to have settings options that the VST plugin doesn't. The standalone then memorizes the settings and the VST version uses them. Have a look in the standalone version for different settings. 

I have windows 8, having a bit of difficulty finding the stand alone version...I know, it should be easy, but when I search for dimension pro files with windows 8 search, I get all kinds of patches and sounds showing but can't seem to find the stand alone icon. Easy with breverb because it's an icon on my desktop. GS, As far as the patches I've tried, I've bounced around to quite a few, piano, strings, guitar, etc. still nothing. I see the level bounce in the track of the dimension pro (midi) when I apply a note with the roland keyboard. I'm outta here for abit, will check back later today....thanks guys....

Open the event list for the midi track routed to DP. If there are any RPNs or NRPNs in the event list, delete them. Save the project then close Sonar. Open it back up and see if that helped.
 
HTH

When you say you can "see levels" when touching the keyboard, are you seeing midi input levels or audio input levels? Two different things.  My guess is you're seeing midi activity, not audio. Also, the registration "Pop-up" window that you're getting when launching DimPro is another issue that may be causing problems... if DimPro thinks you're still using an demo version, it may think you've gone beyond the trial period and it's disabling itself. I would contact Cake support directly via phone.  Someone there should be able to walk you through the proper steps to straighten things out.