keyboard circuit can be scaled.
Remove the diode matrix form a switch buss using the switches and built a 47 resistor
chain of 100 ohm 1% resistors. After all of the resistors are in place bridge the solder
pads on the edge of the board to make a common point for all the switch pads to connect.
Solder the connection wires to the ends of the chain and the common point before you
screw it back to the keyboard.
Attach a digital ohm meter to the common point and one end of the chain. Press a key
and measure the resistance. It should be 100 ohms X the number of resistors between the
pressed key and the end of the chain. IE.. The lowest key should be 0 and the highest key
4700 ohms on a 48 key keyboard.
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