I'm trying to use a Funk Lick guitar or a Telecaster (found in the Cakewalk Guitars pack) along with a certain note played by the other instrument tracks, but because these instruments are chord samples (not note samples), I'm having a heck of a time getting them on key.
 
These instruments are chords - perhaps two-note chords, from how they sound. But I'm trying to get them on key with the specific note played by the other instruments. Whatever key I put this guitar on, it just sounds out of place.
 
How do I achieve this? Thanks! :)

Well, there are software applications, basically specialized spectrum analysis apps that will sort out the simultaneous notes and give you the chord name and voicing. Some will even print a score and convert to MIDI. Most chord samples put the root at the MIDI note that calls the sample, so if you know the type of chord and know where the root should be you should be able to find a match without either software or a trained ear.
 
But if your other notes are sounding a chord that is dissonant with the sample, you are not looking at a mismatch in root pitch, but a mismatch in harmony, and just changing the sample up or down the scale is never going to sound right.

To help explain , first, are you a musician or a non musician creating music? 
This will speed up the process.. no point explaining things in musical terms etc.. 

sock monkey
To help explain , first, are you a musician or a non musician creating music? 
This will speed up the process.. no point explaining things in musical terms etc.. 

I've been using Sonar x3 for over a year, but I'm still technically an amateur.
 
SLAR -- Thanks for the detailed explanation. It seems as though, although I had a hard time precisely explaining the issue, you hit on what I was trying to say.
 
I did consider layering the chord over three or four keys at once to blend itself in, but that would just make things more complicated. That's essentially eight notes playing at once.

You can play as many notes at once as you want to, orchestras frequently play many more, but if you are trying to play on a given chord all of the notes have to "belong" to that chord. Most of the chords in popular music use only three or four notes or the octave equivalents of those notes. If the chord you are trying to "blend" contains notes that are not members of the chord you are trying to match, then you will get a different harmonic quality, if not outright dissonance.
 
The solution is to either find a sampled chord that matches your target music in its chord type, and pitch match its root to the existing chords, or use monophonic samples to build a new chord that is consonant with the rest of the music. If you try to move a chord up or down and play it against an existing chord, you are going to change the relationship of the intervals unless you do so by whole octaves, almost always resulting in an even bigger mess than trying to match a single discordant chord.

OK, so I take it you have no musical training. I asked because sometimes we assume people don't know things and then we get accused of being condescending in our answers. 
 
What I would recommend is doing a little Chord Theory Study. It was the best thing I ever did in my musical life. Once you understand chord theory you can build any chord from scratch without having to look them up in a book. 
I don't read music but you don't need to read notation to study a lot of the music theory concepts. We can use the number system to describe a chord.
Example- a major chord is the I - III and V of the major scale.  We flatten the III to create a minor and so on. It's super easy once you "get it" 
 
A quick Google search finds lots of free sites with lessons. Example: 
 
http://www.pianoscales.org/chords.html
 
Bottom line is it certainly speed things up when I'm editing in Piano roll view and I'm editing chords. 
On complicated songs I'll insert markers on the time line with the chord names so I cane see what should be there when editing. 
 
Example if it says on the Time line the chord is a D, I know there should be D-F# and A. 
This is just a simple example as music gets a lot more complex than triads.