Ok, I hate to spam this thread again, but I just bought the Tascam US 2x2.
 
Installed the driver and settings panel. Saw the Speakers US 2x2 installed when I opened "Sound" in the "Control Panel". 
 
Whenever I played the sound, I can see the green levels going up and down. However, no sound can be heard from my speaker. I turned the "Monitor Balance" to the max. level, as instructed in the Troubleshooting section, but still no sound. I played with different settings in the "Settings Panel" software - again silence. 
 
Drivers are up to date.
 
I tried restarting my computer, I tried plugging out the USB cable and plugging it back in again, still no sound.
 
But the moment I switched back to my in-built Realtek sound card, I could hear sound coming out of the speaker again.
 
I searched Google and found a few people with the same issues as me - but with no responses whatsoever that could resolve the problem - a couple managed to resolve it by upgrading to Windows 10!
 
One thing I noticed was that for properties of the Speakers, under the "Levels' tab, the speaker level is at the minimum, at 0.0 dB. However I was not able to increase the level any higher. The level was stuck at the minimum, at 0.0 dB. When I switched to "Mixing Driver 1" or "Mixing Driver 2" as the default driver, again there was no sound, but in this case I could see that the speaker level is at the maximum. Not sure if these information can help.
 
Anyone is able to advise on this? I'm starting to get rather frustrated - things aren't supposed to be this hard, are they, when it comes to just getting my MIDI controller to work properly with SONAR..
 
Thanks in advance..
 

Bummer.. I didn't. After plugging in the speakers everything works now.
I still had a bit of issues with off sync, then I tried the suggestion to input a positive value in Full Chase Lock timing offset (50 ms). I have had three runs with 0 off sync notes thus far - my best record with SONAR yet.
 
Thanks for the help. A couple of last questions (hopefully):
 
1) For MIDI in/out I just need to select the MIDI controller, and not the audio interface, right?
2) For both playback and recording, however, I will select 2x2, speakers and microphone, respectively?
3) Is there a way to make all these settings default? Including the timing offset etc.
 
For options 1 and 2 I figured the answer is yes because this is my current setting and I seem to be able to record and playback just fine. 
 
Thanks again!

You did switch to ASIO mode?
And it's called Hi Jacking not smap, You should always start you own thread now people will think you issue is the OP's...

Thanks for the replies. 
 
I think increasing the time sync to 50 ms did the trick. I'm making almost no mistakes now. The audio interface is still connected to my desktop though; if anything it should help ease the memory of my desktop at the very least.
 
Just in case you guys are interested, I did try switching to ASIO but ended up having no sound in recording and playback, and in the playback/recording driver option, I was only given the choice for low latency ASIO driver. I remembered having this issue 10 years ago when I had first contact with Sonar and the advice given was to change to MME.
 
But now I've switched to WASAPI shared. No hard proof that it helps, but doesn't hurt to try. 
 
Thanks again.

+1.. ABSOLUTELY use ASIO  You should spend a little time reading Sonars documentation. The ASIO fact is very clear in the second sentence I think. 

Hi,
 
Apologies for bringing this up again. I saw what you guys have advised - to use ASIO. Hence I changed from WASAPI to ASIO. When I changed to ASIO, I was only given the option to select "Generic low latency ASIO driver speakers".  And when that was selected, I cannot hear any sound. Restarting SONAR does not resolve the issue.
 

 
Then when I switched back to WASAPI shared, i have the option to select the TASCAM interface.
 

 
I tried to use WASAPI exclusive, and I repeatedly get this error message:
 

 
I'm also not sure if the issue is related to the drivers, but ever since installing the audio interface, I get fairly frequent issues such as:
 
- Buzzing sounds for certain VSTs. Some buzzing sounds are very loud and distorted and are very reproducible when I I press the keys on the keyboard. Others are softer but still pretty obvious.
- Sounds suddenly become silent. I have experienced when a new MIDI track appears, suddenly all the tracks cease to produce any sounds. 
 
For the first case, reloading the VST solved the issue (but still a hassle). For the second case, I managed to resolve it by repeatedly toggle in and out of the Preference window.
 
I'm willing to monitor this issue again if I'm able to resolve the driver issue above.
 
Sorry again; if there's any help for this it will be appreciated. 

May want to uninstall the "Generic low latency ASIO driver" too. I believe that is something installed by another DAW. It is not a manufacturer supplied ASIO driver.

Hi,
I've tried what brundlefly advised - uninstalled / reinstalled the driver. Renamed aud.ini etc. I also deleted the "Generic low latency ASIO driver" too. 
So after reinstallation and launching SONAR, I could see that choosing ASIO driver now allows me to select the TASCAM 2x2 drivers in playback/recording.
 
There is now a new problem I'm having. Whenever I launch SONAR, I can't play music on my browser or media player. When I open up a new browser, I get the following error message when launching SONAR: "There are no audio devices for the current driver model on your system. Please go to Edit/Preferences/Audio/Playback and Recording etc." and true enough no audio. The moment I close the browser, and relaunch SONAR, it seemed to work again.
 
So what I did was, in the sound driver properties, I unchecked "Allow applications to take exclusive control of this device". I rebooted my computer - problem still remained. 
 
Suspecting it could be a SONAR issue, inside SONAR, I also checked "share drivers with other programs". I also restarted SONAR - problem still remained. 
 
I was more certain it is a SONAR issue, because I was able to play music on my browser and the media player at the same time. The moment I launch SONAR everything went haywire. 

After which I tried to experiment by going into WASAPI shared / WASAPI exclusive / MME32 etc. I got the same error messages as before: "The following drivers either do not support the current audio format etc..." And again no sound in all the drivers.
 
Now the problem just got worse. After this brief "experiment", I could not find any drivers when I switched back to ASIO. Not only that, even after closing SONAR, I couldn't play anything in my browser, or media player. When I tried to test the sound, I got the message "The device is in use by another application."
 
Update: After restarting my computer, I was able to find the drivers in ASIO again. But the problem still remains whereby when I opened a browser / media player, the drivers immediately disappear. Is ASIO meant to be exclusive? I would think they should still allow us the option to share the applications - especially since I've already chosen that. This is quite undesirable for me as I do need to listen to music while working on SONAR at the same time.
 
Please do advise, many thanks in advance.

Thanks for the response.
 
1) I guess an outboard mixer will mean an additional hardware purchase? I am guessing a cable with an audio jack (to connect to PC sound card) and into an "in" port of the audio interface..
 
2) How do I ensure that the sound driver is being shared by all? I've already unchecked on my playback/recording to enable it being used as exclusive. I also checked SONAR to share drivers. But that didn't solve the problem once SONAR is turned on. 
I tried launching SONAR first, before opening the other apps, but once I did a media playback, the drivers in SONAR disappear. How do I check the sample rate and bit depth of my browser and media player?

Ok, after purchasing an audio interface and an outboard mixer, all seems good now. Seems a bit of an overkill for now considering I merely wanted to eliminate latency in my keyboard playing - but I'll never know if these will come in to greater use in the future.
 
Thanks for the help guys.

This reminds me of an issue I had with getting sound from both Sonar and Windows using my dedicated audio interface.
 
It seemed to just work by default if I let Sonar run at 44.1/16.  That is the default Windows sound format as far as I can tell.  The audio interface allowed anything, including Sonar, media players, browsers, etc., running on the PC to play over my monitors.
 
But if I changed the sampling rate of my audio drivers through Sonar, suddenly no more Windows sounds!
 
Then I found this little trick.  Go to Windows Sound > Playback Devices > Select your Line 1/2 output (or whatever you are using) > Properties > Advanced > Adjust the default format to what Sonar and your audio interface are now set at.
 
Boom!  Both Sonar and Windows can use the same audio output again 
 
Interface drivers may differ, so YMMV.