Hello. This is my biggest problem at the moment; I can't get a sound as smooth and consistent as I want between my index and middle fingers. Also, it seems as though there is more effort required to sound a note with my middle finger, and as a result when I play really, really slowly to a metronome it becomes obvious the notes played by middle finger are often ahead of the beat. I spend hours practicing slowly but it seems to be of no avail. I just want to be able to groove! Does anyone have any advice/suggestions? Anything would be greatly appreciated.