When working with MIDI Cakewalk Sound Center only plays one instrument for all the tracks?

I recently started to create projects and some notes using MIDI, and soft synths. I love to use Roland TTS-1 to quickly sketch things out. Also its level of customization is awesome. It's really great.
 
I coordinate it with Cakewalk Sound Center and SI-Drums, depending on what I need.
 
Everything sounds as planned... they are very powerful tools.
 
However, if I have multiple MIDI tracks; a track for a bass, a guitar, a flute, a piano, drums, strings..., for instance, then the problem with Cakewalk Sound Center I mentioned in the title of the thread appears. 
 
After I change the soft synth from Roland TTS-1 to Cakewalk Sound Center in a particular instrument, it sounds perfect for the first track I switched to Cakewalk Sound Center.
 
But if I want to use Cakewalk Sound Center in another track or more tracks than the first one I selected, then it's a different story. 
 
i.e. let's say I selected a Guitar instrument from CSC in the first track and then I want to use another Cakewalk Sound Center instrument in a second, 3rd or 4th tracks, all the tracks will use the last instrument I chose, not the patches I selected for each track individually.
 
Thus if I have a MIDI bass track, a guitar track, flute, piano, drums, strings, etc, and for instance the last instrument I selected within a single track under Cakewalk Sound Center control is the flute, then EVERY single track where I am using CSC, will only play flute notes!? So you can imagine....
 
I'd swear it worked fine the first time I tried.
 
I wonder if I am doing something wrong. My experience with Music Creator 6 is quite limited for now. But I LOVE the program so much.
 
Any help would be appreciated.
 
ps: I tried inserting Cakewalk Sound Center as a soft synth multiple times just in case it worked individually when it came to patches (Cakewalk Sound Center 1, Cakewalk Sound Center 2, Cakewalk Sound Center 3, 4.... etc etc) applying the instruments within the tracks to every instance separately. But this approach didn't change anything at all.

Thanks for your advice Greg! I will try what you told me. I am not going to use Music Creator 6 these days.., well, at least not much, because my brother is going to marry tomorrow, and I have to go to the church to learn some protocols and stuff.

Learning this program is fun, especially experimenting with it. Another program I love and whose author I respect a lot is Synthfont. Very clever design. 

I am listening to your music while writing, and have been listening for a while now. I am liking it a lot in general.

My favourite for now is Leave it Alone -it sounds like one of those beautifun indie songs you are lucky to listen to from time to time- and Waiting for the Light to Change is equally fantastic.

I finished listening to On the Beach, also a very nice song. Now listening to Never Going Home. Sounds pretty good so far... If only a bit sad, but it rains a lot where I live so I certainly know well what melancholy is.

Again, many thanks for your help. Being unfamiliar with something is one of the biggest limitations when you start, but it's also a good thing when you find out what works, what doesn't, and you start making decent things.

Take care of yourself. See yah' Greg Fields

In Sound center, which I like and use..... it is a bit different from TTS.   As has already been pointed out.... Sound center is one sound per inserted instance. 

Be sure you are selecting a new and unique sound for each instance..... if you do not choose a different sound, it will remain on the defaulted sound. 

If you are loading the tracks manually, be sure you are sending the midi data to the PROPER AND CORRECT instance of Sound center in the synth rack.  When you choose the midi source track output....ALL the available synths in the project will show up.... selecting the correct one is important. 

Lets assume you have 3 instances of Sound center. Bass, piano, strings.  If you select the first instance of Sound Center for the 3rd midi source it will play the sample for the first one (bass) as opposed to strings, that you expect to hear.  

Channels are useful if you are directing the midi input from a keyboard synth to a specific track and synth. Once the midi source is recorded, the midi channel is not as important.... but the output destination (the synth) is.  And again, be sure the samples (patches) are set properly so you hear strings and not bass...or whatever you want to hear. 

Thanks Beagle and Guitarhacker for your kindness and your advice. It's so nice being here with people like you around, and the help people get from you.

Yes, following your guidelines definitely worked for me. Too bad I surpassed the limit number of simultaneous instruments allowed in Music Creator 6, but other than that everything is working smoothly now.

I am thankful, it's effin nice of you. Cheers, take care of yourself and good luck.  

you know.... I use the process of adding one track at a time. So I rarely have a full synth rack. I add a track...... insert the synths and get the track right, bounce the music to audio and delete that synth, and move on to the next one. 

Having a synth rack full of synths takes processing power and I want it all for my mixing