For the moment (I don't have the manual here with me) I can help you only (I hope
) for question 2,about one touch:
they are available only for the position of the bank select: there are about 285 factory styles and 120 assignable custom style (there is in the bank style selection a button on LCD to press to access them).
So, if you want to use OT for a your style, you have to locate the style in a position of "custom style" page.
They don't work for styles selected using the Style Finder.
I dunno if I was clear in my explanation, sorry but in these days I don't have my G70 with me...
Regards,
Rival