A lighting keyboard includes a keyboard unit, and a combined circuit and lighting unit. In at least one embodiment, surfacing units are stone. Alternatively, the dispensed amount may be determined in accordance with one or more \u201cbalance management rules\u201d. The particular calibration tracks vertical position is derived using the average read head output. This is followed by a read andor write access to the table memory by taking the preselected base address as a starting point for computing the address used for the readwrite access in the table memory for each access operation according to an arithmetic computation rule. The rotor chamber and the fin members are cooperatively shaped and configured to maintain a continuous air lock closure.