If you dig deep they said this- But still at the heart of the beast will be my trusty old Delta 66 card.  
 
 
I said this in #15 but they did not answer : Anyhow this sounds now like you are having a audio interface driver issue, Are you using the ASIO audio driver? Delta 66 is a real old card. They are known to die of old age too. 
 
So I'm waiting on an answer to the ASIO question and if the OP tries a lower sample rate to see if TTS-1 plays. 
I've had TTS_1 go weird on me a few times so I'm avoiding it right now. I only use it to OPEN midi files to see what's up, I then replace all the sounds with better VST's. 

I've been kinda busy the past couple of days so I'm just getting caught back up on all this. You guys have thrown so much stuff out there to think about and try, I haven't sorted through it all yet.
 
But I do have positive news to report. A couple of your comments led to it. First, I realized that it's been quite a while since I've checked on available updates, and turns out the version I was running wasn't close to current. So I installed the latest update last night. I also tried I guess it was Johnny's advice and reduced the rate down to 44.1. The system is still stuck at 24 bits, even though the front page of the song shows 44.1k @ 16 bits up toward the top of the page there. The section in Preferences where it shows my system set to 24 bits is grayed out and I haven't figured out how to make that active yet. So I'm running with a bit of a mismatch currently, but it doesn't seem to be affecting playback. I haven't tried any recording yet.  So anyway, I dunno if it was the update or reduction of the rate that straightened out the problem with TTS-1, but it's behaving normally now. Well, with at least one MIDI file that I brought in (and subsequently saving as a cwp file). With another, I dunno where I've gotten crosswise with TTS-1, but I can't get it to make a sound. Even though it seems that I have everything set the same between the two files. I guess I need to take a closer look. I've missed something somewhere.
 
Both Johnny and bvideo mention that TTS-1 isn't just a Cakewalk wrapper for the GS Wavetable synth. So I'm wondering why it sounds exactly the same? Or maybe I've misunderstood what y'all were getting at. I like Rapture a lot, but somehow it got corrupted on my machine, so I've d/l'd it again and reinstalled it, but I haven't gotten to try it out yet.
 
One question -- you guys keep referring to setting my kb to "local off." Is this a setting I can find somewhere in Sonar?  Because if it's one that I have to execute from my kb, then I've got a problem and I don't know what the workaround will be. There are instructions within the documentation for my kb on accessing MIDI setup and controls, but unfortunately my kb does not do what the documentation sez it's supposed to do. From the very git-go, where it tells me how to get into midi setup, a different message appears on my kb's display from that shown in my kb's docs (and it is the docs for my kb too), and none of the other keystrokes do what they're supposed to, either. So until and unless I can get some response from the Casio community on this, I'm stuck with whatever the default configuration is with that device.
 
 

Don't worry about the 24 and 16 bit that's word length and has nothing to do with clock rate. 
Sonar works at 32 bit anyhow. 
The TTS-1 issue was solved by using a lower clock, here's lots of posts about this as I linked above. 
You can still use 48 which is really all you need for hobby recordings. 
 
Did you try OPENING a midi file yet? TTS-1 will load and play if there is nothing set as midi output in MIDI Devices. 
And I never said TTS-1 was a wrapper for MS wavetable? It is a complexly different type of synth. Wavetable is 4 bits.. terrible fidelity. The TTS-1 is a GM playback and most DAW's have one The TTS-1 is stuck in time as well and has not been updated for a long while, It's best use is to pre view files and get things started. 

Johnny, sorry if you misunderstood. I didn't write that you indicated that TTS-1 was a wrapper for MS Wavetable. I was writing that I thought it was. But what I did note is that it sounds the same as GS Wavetable. But I guess it's greater than 4 bit at least.
 
As for the clock rate, I prefer to run my Delta 66 at 96k, and I would like to do so in Sonar. Too bad TTS-1 can't handle it.  My recordings ultimately aren't "hobby" related because I will be producing CD-compatible Wave files. I realize CD files are 44.1k/16-bit, but I like to work at the higher rate, the convert downward after I've completed all edits to the music.
 
I'm gonna try opening a midi file again with the GS Wavetable deselected. First time I tried, TTS-1 didn't load itself. But that was with the older version of Sonar I was using. I'll give it another try momentarily.
 
 
 

Yes it is a newer feature I think starting with Splat, but might have been X3. 
Huge time saver if you want to audition midi files. Sure they will play using MS Wavetable in Media player or Win Amp but being able to see how many tracks and quickly mute the bad stuff is handy. 
And then if you like the file quickly save as to a CWP and start making improvments. 

I'm working on a fresh MIDI file, and I'd just like to report that, with GS Wavetable de-selected, TTS-1 came up fine. I like.

Also, I finally found out how to set my Casio kb to "Local Off."
 
I was having a problem accessing the MIDI section of the keyboard because it wasn't following the directions in the manual. I posted a message about this over at the Casio Keyboards forum (yep, they have one) about it. Fortunately, a very helpful individual promptly replied to my plea and explained how I needed to go about getting into the MIDI section. And once I was in, I was able to set it to "Local off." Now the keys produce no sounds, which I guess is a good thing -- for the DAW, at least.
 
So now I get to go see if that might have cured the kb's playing early problem -- the original point of this rather lengthy -- but very entertaining! -- thread.