public void Write9000(byte data)
{
_Volume = (byte) (data & 0x0F); //Bit 0 - 3
_DutyCycle = (data >> 4); //Bit 4 - 7
if (_DutyCycle == 0)
DutyPercentage = 0.6250;
else if (_DutyCycle == 1)
DutyPercentage = 0.1250;
else if (_DutyCycle == 2)
DutyPercentage = 0.1875;
else if (_DutyCycle == 3)
DutyPercentage = 0.2500;
else if (_DutyCycle == 4)
DutyPercentage = 0.3125;
else if (_DutyCycle == 5)
DutyPercentage = 0.3750;
else if (_DutyCycle == 6)
DutyPercentage = 0.4375;
else if (_DutyCycle == 7)
DutyPercentage = 0.5000;
else
DutyPercentage = 1.0;
}