Hi!
Before I end up writing a bunch of confusing stuff I will need to clarify something.

Are the sounds you're using coming out of your keyboard or your PC?
If you need to get a software instrument (or a few) for the PC to run right inside Pro Tools it's no problem. You'll just have to get them in the right plug-in format (I think it is RTAS in Pro Tools) and make sure that your PC meets the system requirements for plug-in instruments you will decide to use.

If on the other hand it is your MIDI keyboard that produces the sound (You will have to tell me what it is) it wil pretty much depend on it's synth engine and capabilities.

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A gentleman is one who never hurts anyone's feelings unintentionally.
- - - Oscar Wilde