I'm having some problems with the chromatic sequence running down the fretboard in major or minor 3rds. Example - C, Ab, B, G, Bb, Gb, A, F, etc. It requires constant and smooth shifting. (If you're having problems thinking of the passage, jaco, metheny, wakenius, and a host of others use it ALL over the place.) Does anybody have any advice on how to improve on this difficult sequence? thanks!