section 7 page 89 of the E-70 manual I downloaded from
http://www.rolandus.com/support/owners_manuals/?group=2describes the use of the transpose button.
In short, you set the value for the transpose function in the parameter menu (section 9 in the manual) ranging from -11 to +11 semitones.
In your case I would set the value for the tranpose button in the menu to minus 2 as you want a full note (= 2 semitones) down from C to B-flat and G to F etc.
And you activate or deactivate the transpose function itself by hitting the transpose button. The little red led next to the button shows whether the function is on (led is lit) or off (led is not lit).
Hope this helps
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