It's been a long time since I read up on Joe Satianis' pitch axis theory (I assume that's where you got it from?), and I'm definetly no authority on this, but if my memory serves me well this is how I interpretted it.
First let me say that it is quite confusing and I have found some problem w/it.
First you build a chord progression around a common tone; lets say we play a 2 5 1 progression in Cmaj and we make the common tone A, we would have these chords; D- G9 C6

now you would apply all the scales of correct tonality over each chord that contained the A note. So for D- you would have D dorian, phrygian, aeolian, harmonic, and melodic minor in which to create in. Then you would do the same for the G9 and the C6. What you end up with is a very chromatic approach to soloing. His explanation of the whole process is more confusing then the actual process. Remember when doing this to make the pitch you have selected the focus of your solo, also don't be afraid to change your pitch axis every couple of chords, Satch does.