ASIO4ALL is a valiant attempt to make Windows do something it doesn't want to do, but I have found in a few cases that just having it installed messes up other drivers even if ASIO4ALL isn't selected in any way. 
 
What you're experiencing is something I've never seen mentioned in these forums, and that goes back years. I don't think you'll find a solution within Sonar, although you may find settings within Sonar that allow it to cope with the unique elements of your setup.

I don't have ASIO4all installed. 
 
I have a Focusrite Scarlet 2i2 hardware USB interface which came with, presumably ASIO drivers. 
I must have been mucking about with settings (perhaps accidentally checked or unchecked something with the touchpad? Problem is, I'm not sure what is supposed to be what. I can provide screenshots if you'd tell me what screen in preferences is applicable.

One more try for screenshots...ugh 

gotta do 'em one at a time it seems. And wait.

 

last one, unless more are requested. I'm getting the hang of it now! (Jeopardy theme plays)

 

Well, everything looks in order from the audio end. What about the MIDI and synth end of things?

Standby for more screenshot madness. I can't thank you guys enough for taking a look. And I got 'em all on in one post!


 

It's not entirely impossible to use the MS Wavetable Synth with ASIO drivers. Some, but not all, interfaces do indeed recognize it as as external hardware device.
My old E-MU0404 could see it, as does my Akai EIE Pro. It looks like the 2i2 can see it as well.
Deselect it as the MIDI output device. You don't need it, and it is most likely the cause of your sync problems.
ASIO latency settings do not affect the latency from the MS Wavetable synth. It is subject to the default latency of your built-in sound card (probably 250ms or more).
From the outset of your project, you can use TTS-1 to play your imported GM2 MIDI files. It will be synced to your project settings, unlike the MS Wavetable synth.
The problem here is that you are using two drastically different time references.
Get the MS Wavetable synth out of the picture, and you will be using only one. Moving forward, you should be good to go.
 
Also, the Audio metronome is fine. It's really just a dedicated synth, and it's easy to get along with.

Robert has the right answer, disable the MS Wavetable synth and things should work. You might want to invest in a midi controller, you can get a little one with a usb interface pretty cheap. They make life easier if you're doing things with soft synths.

I don't care how I did things in the past, but it seems clear from the wonderful advice I've received here that the NEW way is:
 
Upon starting a project that may at some point contain MIDI tracks:
Insert a soft synth
Run all MIDI tracks through that synth (or another one if a different sound is desired)
Use the AUDIO METRONOME
 
DON'T RECORD ANY AUDIO till this is done or I'll have to slide it over. I managed to get that done, so I got my project done, but it was a PITA to get it where it was. Zooming in helped but it was still a bit tedious, you can't really snap audio to a grid!