1. Dexterity is the most important. The ability to control the fine motor skills is what is necessary to build. How? Practice, practice, practice.
2. Strength is necessary of course to a degree, but not as crucial as dexterity. At first it might be necessary to build a certain degree of strength to get the pinky usable. But after that necessary minimum it's time to work on dexterity!
Originally Posted by: JeffS65
... that ascending 1-3-4 is just beyond what my pinky can do and I've tried every drill I can to make it happen.
Have tried this one?
http://www.guitartricks.com/tutorial.php?input=419
I also just published these that might help:
http://www.guitartricks.com/tutorial.php?input=898
http://www.guitartricks.com/tutorial.php?input=899
Best of success!