If you added it as a simple instrument track.... you don't have to undo anything. The 2 tracks are already there.... one is just hidden. There is a window where you can easily change the setting and changing from simple instrument to a 2 track set up is as easy as checking or unchecking a box.  I am not on the DAW right now but it shouldn't be hard to find.  I know this exists because I have used it to change that very thing myself.
 
BTW: if you are liking TTS, you should open the TTS GUI.... it looks like a mixer board, and take the time to double and right click on every button and thing in it. There is a lot to this synth that is just below the surface. Also be sure to click on the stuff that is NOT in the channels. There is a layer or two below that GUI that most people don't know is there.

I would have mentioned the "Split Instrument Track" function but could not find a reference to it in the Track View Track Menu help screen. It is the function one would use to break out an instrument track into it's component audio and MIDI tracks. Maybe  the function is only in the popup menu for the track. In any event, it is easy enough to mute an instrument track MIDI by taking the track velocity slider (aka Gain in Inspector) to 0. Then double-click the slider to return to default.

Again, thank you so much! Over the weekend, I put in an audio track with the TTS in it, and set up the MIDI tracks "correctly" Worked like a charm. Guitarhacker, I had indeed  inserted Track 1 as a Simple Instrument. I copied it to a new MIDI track before reading your post. Thanks just the same. I'll definately be checking out the TTS in more detail. I really like using it.

I used TTS extensively when I first started and poked around into it's nooks and crannies. It is a versatile synth and sounds good as well.
 
I haven't used TTS in quite some time since now I work mainly with wave tracks and when I do use synths and midi, it tends to be the ones that use samples such as Cakewalk Sound Center and the Native Instruments collection....
 
I'm glad you are learning TTS and liking it.
 
Some time back, a fellow Cake user posted a song in the songs forum that was done completely in TTS. It was a classical orchestral composition, and to top it off, he used the mouse to place each and every note in every track in the thing. Totally amazing piece of work. He didn't say, or I don't remember how many instances of TTS were used or how many tracks were in the project.....