Is there a recommended height above the white keys for black keys when they are depressed? In other words should they be say 14 mm above the white keys with a 10mm dip to about 4mm in the down position? Or is it 'piano specific'? I would appreciate your comments. James Perkins 42 Marlee Road Parklands WA 6210 Australia 08 9581 6354 Mobile 0401674447
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