See here. I wouldn't really call it a tutorial, especially not a good one, but may be enough to get you started. :)
As for the frequency knobs, each has two parts, lower (wider), and upper (thinner). The lower left controls the first two digits, the upper one controls the last digit in front of the decimal. The lower right controls 1st digit after the decimal, while the upper right controls the last two digits (00-25-50-75).
Like firmek said, use the scrollwheel, don't drag.
Yes, both.