Well, setting the patches in TTS-1 definitely solved this mystery. But I still have one niggling problem I can't seem to figure out. Whenever I change the patches on one track -- or whenever I start the piece playing again -- even if it were only paused -- that track always reverts to piano 1. It didn't used to do this, but now it's doing it consistently. And when it reverts to piano 1, it's also reverting to a User setting -- User Number 2. This was happening to a couple of other tracks also, but they've stopped misbehaving. Any idea why it's doing this?

mwmcbroom
Well, setting the patches in TTS-1 definitely solved this mystery. But I still have one niggling problem I can't seem to figure out. Whenever I change the patches on one track -- or whenever I start the piece playing again -- even if it were only paused -- that track always reverts to piano 1. It didn't used to do this, but now it's doing it consistently. And when it reverts to piano 1, it's also reverting to a User setting -- User Number 2. This was happening to a couple of other tracks also, but they've stopped misbehaving. Any idea why it's doing this?

Have you got any program/bank changes on the track? Check the Event List - you should be able to filter out everything else, so it's obvious if they're there.
 
Also, check the program/bank is set to none in the Track Inspector. This will override what you've set within TTS-1.

The event list is clean. This is the first thing I checked. Nothing but notes.
 
When I set my banks to "none" all the presets disappear, so I never do this. In TTS-1, I always select from one of the "Preset Normal" selections.
 
I got rid of the offending behavior by inserting a soft synth and assigning it to that track. That took care of the problem. ;-)

mwmcbroom
The event list is clean. This is the first thing I checked. Nothing but notes.

be sure you're not filtering out everything but notes

I'm not applying any filters -- that I know of.

Just downloaded and opend the file,,, what a big mess! 
First thing is if you set your midi output to NONE Cakewalk will open a midi file using TTS-1 and load everything the way the author intended it to play. There is no reason to take any other action to play the file. 
All tracks will load,  even unwanted ones.  
So delete all the garbage first!! 
Your project has unnecessary clutter. 
There was no reason for you to insert a second copy of TTS-1
 
Then if you don't like the instruments it is a simple matter of changing those in the track inspector. 
I cant see any other issue. I had no problem changing the instruments using the track inspector.  I guess the console would also work but I don't use it for that. 

That's an old file that has already been extensively corrected, Sock Monkey. I should take it down.