Exported Mix sounds terrible

Maybe someone can help.
I have a 28 track mix that sounds incredible when I play it direct from Sonar X3.
As soon as I export to a wav....it sounds terrible.   Nothing like "what I hear".
So to narrow down the problem I exported only a Synth Drum track and the Bass track.
Again, in the program sounds awesome.
 
When I export there are 2 problems I can hear.   One, is its very quiet....and when I raise the volume to hear it, the Bass overpowers the drums.  
If there was a way to attach the mp3 for you to hear, I would.
 
Any suggestions would be helpful

You can upload the MP3 to soundclick or soundcloud and post the link here. We can then hear it.
 
Hearing it is the best way to determine what you may be doing wrong.
 
First though, check all your routing assignments. The mix should sound exactly like what you hear. The low volume is a minor issue but the sound is what you need to work on and solve first.
 

I am using a laptop with an internal soundcard and a Roland Quadcapture interface with everything on the default settings.

check the console if your sound cards output meters are at zero…(after the bus meters)

Here is a link to the mp3
https://soundcloud.com/ba..weinberg/drum-bass-test

You might want to check your mix in mono and set the bass level while listening in mono. (master fader interleave or from your audio card control panel so as not to change within sonar. My focusrite has a mono button for checking in mono.) I switch to mono to check volumes of vox, bass, things predominately mono. See if that helps.

Try this: Select all your tracks and "Bounce to Track." This will create a new track in your project that represents your mix.
 
Solo it and listen to what it sounds like. It should sound like your mix, but lower in volume because your master fader will probably be down somewhat to accommodate the levels of all the tracks. If you turn the master up, the sound should be the same.
 
If the mixed sound is NOT the same, then there is something set wrong in the export dialog. If the sound IS the same, drag the clip with the mix to your desktop and play it back through something else (burn a CD or whatever) and report back on what happens.

To save everyone some reading in the above link:
 
"The problem was Windows Media Player all along. It had the "SRS WOW Effects" settings on. The track sounded exactly as intended when I took that setting off."
 
I second Craig's proposal to bounce everything to a track in SONAR, but choose Buses as the source, and select only the Master. Then set the output of that "Master Bounce" track direct to Main Outs, and A/B the live and bounced mix. You can also invert the phase of the Master Bounce track and it should null with the live mix, though unfrozen plugins that have random elements built-in can prevent perfect cancellation.
 
 

I believe I have the bass thing handled, but still have issue with overall volume.  I did everything suggested and getting same result.  I import the exported wave so I can measure the db's.   When playing direct from the tracks the db floats between -3 and -6 db.   When I play the imported wave, it floats between -18 and -12.   All my faders are on 0.

This must be a routing problem, it's the only logical explanation.
 
Please list what tracks & busses you have in your project, how it's routed and also what sends you are using.

The Quad Capture uses a GUI mixer. I suspect if you turn down a fader here, or add compression or ?? it might result in a change to your bounces. Worth a shot I say. 
 

No, you're right, interface mixer settings shouldn't matter to levels inside the project.
 
But we still don't know what your Source selection is for bouncing/exporting, which is a major factor in the result you get. If you bounce a single track to another with Source = Tracks, I wager it will bounce at the expected level. If not, somethings's going on with gains, offset mode,  mono/stereo interleave, mono/stereo track format, pan law or... something. 
 
Assuming a single track bounces at the correct level with Source = Tracks, then you need to look at the bus I/O levels (both software and hardware) that get involved when you use Buses, Main Outs or Entire Mix as the source.
 
Another possibility if it's only synth tracks that are changing level is that the rendering process is producing a different level than the live output. Try freezing synth tracks first, and make sure the levels are not changing at that point.
 

What happens if you freeze both tracks, copy the results into two new audio tracks routed to Mains, then solo these two new tracks?