<https://computercraft.ru/topic/1913-openpiano/#comment-28443>
<http://schema.org/text>
"function ButtononClick(self, user)\n  computer.beep(self.freq, 0.5)\nend\n\nButton1=Form1:addButton(41,7,\"До\",ButtononClick)\nButton1.H=3\nButton1.W=13\nButton1.freq=264\n\nButton2=Form1:addButton(41,11,\"Ре\",ButtononClick)\nButton2.H=3\nButton2.W=13\nButton2.freq=297\n--и т.д.\n\n\n"
<https://computercraft.ru/topic/1913-openpiano/>