Can't seem to get any sounds out of Dimension pro. I think I've setup in preferences correctly. Also I/O of the track. If I follow steps, insert soft synth and choose SI-Electric Piano as an example, it will immediately be there with my keyboard, so not sure why I'm having difficulty with Dimension. First time trying it, and have loaded samples from program browser into Dimension and can see levels in X2 track when touching keyboard but still nothing. Any suggestions?  

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.

Thanks GS, I've tried your suggestion, still not getting the sound although I can see the levels. When you say, ensure midi track is routed to output of synth, can you explain abit further? Do you mean as I insert soft synth and the following window comes into view....at that point?

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.

Have you tried running either in standalone mode?

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
 

Thanks Robert, When you say the synth needs to have its output routed to one or more audio tracks, how do I do that? Can you give me a few steps to follow pls?

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.

Thanks for your help. I've tried the suggestions here and still can't get any sound from dimension/rapture. It shouldn't be that difficult I know but something is missing. I see the levels happening in the track view and the I/O are setup, sound from program browser is there,etc. I'll keep on working on it, what a waste of time and frustration...

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.