I have used the TTs-1 as my go to, start a project synth for a long time now.
I have used it in 4 versions of Sonar both 32 and 64 bit. To me it has been the only synth that is rock solid dependable. And I have gone in a tweaked a few parameters too, never touched the tone controls however, guess I glad I didn't.
But you only want to use the TTS-1 for a GM sketch pad to listen to pre done midi files and get your song going. There are much better sounding synths included with ,,, oh ,,that's right,, you have x3 which is limited, that's why I went with Studio as it has way more, any how, look on the KVR web site and try the freebies and demos. I think you can upgrade to Studio cheap and that will be money well spent.