The MS synth is notorious for producing latency. Dump it.

To say as others have tried, Use a soft synth.

Jerry

Now I know what a soft synth is and I've learned what VST means.  I'm a guitar player who can play some keys.  I'm not up to speed on the language used here.  I inserted the TTS-1 soft synth into my project and the latency problem ended.  I've still got the first recorded track changing the settings on my keyboard, so when I try to add a bass line to a previously recorded piano track, theplayback changes my keyboard to the patch from the first track.  I think the various soft synths (Bass, Drums, etc) may solve that issue. 
 
I can't believe it's taken me at least 6 months since I got Sonar to discover the soft synth module.  The tutorials with the program seemed geared to the latest features in editing and made the assumption that any user was already familiar with basic functions.
 
I still find the software incredibly difficult to learn and work with.  I've supported computer systems for over 20 years and I've written documentation for a company with $500 million in annual software sales.  In dealing with Sonar I've run into a lot of "Just do XXX" and I don't have the slightest clue what "XXX" is or how to do it.

MerlinSuderman
Now I know what a soft synth is and I've learned what VST means.  I'm a guitar player who can play some keys.  I'm not up to speed on the language used here.  I inserted the TTS-1 soft synth into my project and the latency problem ended.  I've still got the first recorded track changing the settings on my keyboard, so when I try to add a bass line to a previously recorded piano track, theplayback changes my keyboard to the patch from the first track.  I think the various soft synths (Bass, Drums, etc) may solve that issue. 
 
I can't believe it's taken me at least 6 months since I got Sonar to discover the soft synth module.  The tutorials with the program seemed geared to the latest features in editing and made the assumption that any user was already familiar with basic functions.
 
I still find the software incredibly difficult to learn and work with.  I've supported computer systems for over 20 years and I've written documentation for a company with $500 million in annual software sales.  In dealing with Sonar I've run into a lot of "Just do XXX" and I don't have the slightest clue what "XXX" is or how to do it.

Sonar is actually very easy to operate. Pick-up Scott Garrigus' Sonar book. It got me up and running smoothly in less than 45 mins. Now, the book is old, but the basics are still true. I think it's a great resource for any Sonar beginner. It's laid out in a very easy to follow manor. 
 
BTW, I'm no tech guy in the least.

Awesome, yes it takes a lot of us months to get up to speed. It is worth it and visiting this forum is probably one of Sonars best learning tools. Don't be afraid to even say,, I need step by step instructions to do X. If someone has the time they will be glad to do this. 
 
So your making good progress. 
The issue with program changes is when you use a multi timbral synth ( one that can play more than one instrument ) you need to use channels for each instrument. 
The TTS-1 can play 16 instruments and drums default to Channel 10 , the General Midi ( GM) standard. 
So I had my own system of Piano on CH 1 , bass on CH 2 etc. 
But that said TTS_1 is a basic lo fi synth and I only use it as a starting point. 
From there you can upgrade your sounds by exploring the other VST's. Like SI Bass and Addictive drums. 
Those can all just use Channel 1 because they are only one instrument at a time. 
 
To stop Sonar from sending Channel info to your Keyboard you'll need to go into it's settings and shut of receive PG info.. That's why I said it gets too complicated :) 
 
 

If you are using internal sound card suggest you learn about the WASPI driver otherwise you will never get good results.  What are you using as your input feed?   The line in on the sound card???

internal sound cards are plagued by horrible latency (you'll find that out once you get enough tracks going and adding VSTs on type of your soft-synths).
 
But then what would expect from a part that costs about $1.43 to manufacture as compared to a decent $100 or $400 or even high caliber $4000 sound card?
 

actually I use ASIO4all over WASAPI on my midi only system. I tested both and ASIO4all was much better latency and stable as a rock. Been using this for 6 month now. 
If the OP switches to soft synths he will no longer need to record audio. 
But for audio you absolutely need a proper ASIO interface. 

Cactus Music
actually I use ASIO4all over WASAPI on my midi only system. I tested both and ASIO4all was much better latency and stable as a rock. Been using this for 6 month now. 
If the OP switches to soft synths he will no longer need to record audio. 
But for audio you absolutely need a proper ASIO interface. 

Correct. He's a guitar player and I'd imagine one day he will want to record his guitar when he discovers that he can have amp sims for no more than two Benjamins that give him about $10,000 in amp choices (if it were hardware).
 
At least the OP should be aware that a $100 (minimum) sound card (often referred to as an interface) is looming on the horizon.

Also, I did use ASIO4All on my laptop when I was doing remote mixing. Until I got my ADK Pro laptop that is.

Just be aware that ASIO4ALL works fine on some systems and not on others...luck of the draw.