I'm a newby with this machine and need some advice. If you groundbalance with the pinpoint method at a specific spot and set the knob at, say 7, and you in future come back to the same spot, after having groundbalanced at various other spots, can I simply set the knob back to 7 without doing the pinpoint thing again? In other words, does the groundbalancing knob work on its own, ie without the pinpoint?