Not sure if this will be helpful..... but it describes how to set TTS up properly using the channels in TTS. It's from my website. While it refers to my set up and rig, simply substitute your sound card and you should be OK.
ADVANCED TTS set up and operation.
You only need one instance of TTS to be able to play 16 different midi tracks as 16 different instruments. In this demo I will explain just how you accomplish this by starting with 3 midi tracks and one instance of TTS.
So…open a new project ( I opened a normal project and deleted the audio track and then inserted the midi tracks needed and then inserted the soft synth) and insert 3 midi tracks and one instance of TTS. I have:
Track 1 midi piano
Track 2 midi bass
Track 3 midi strings
Track 4 Cakewalk TTS1-1 (audio track this is where TTS lives in this project)
Use the track icons…it makes it ease to know what track you are working on.
Understand that this is just a basic setup of TTS to show you how to setup multiple instruments in one instance of TTS and get it all working.
Set Track 1 (piano)
Input FR channel 6
Output 2-Cakewalk TTS1-1
Channel 1
Key 0
Bank & patch = piano
Set track 2 (bass)
Input FR channel 6
Output 2-Cakewalk TTS1-1
Channel 2
Key -12
Bank & patch = bass
Set track 3 (strings)
Input FR channel 6
Output 2 Cakewalk TTS1-1
Channel 3
Key 0
Bank & patch = strings
A NOTE about my set up..... Notice that all 3 tracks are using the same input....FR channel 6. (Focusrite=FR) This allows all three channels to “hear” the midi keyboard which I have set to transmit on channel 6.
I could set each channel input to a different channel. By doing so I have to change the midi keyboard to transmit on that channel....none of the other channels will hear it, and that can be very useful in recording as you will see shortly.
By setting all 3 channels to the same midi input channel (channel 6) I am able to play all the parts into the three channels with out changing the midi transmit channel on my DX27S. I arm track 1 and record my parts doing the same for the next two tracks. Since the outputs are set to different channels they are sending their midi data to different channels in the TTS synth. The synth looks at the channel number, and routs that data to that channel and applied the patch & bank info you assigned to it and it carries out those instructions. The result is that you hear 3 different instruments playing from your speakers.