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 $D412/54290/SID+18:  Voice 3: Control Register

   +-------+------------------------------------------------------+
   | Bit 7 |   Select Random Noise Waveform, 1 = On               |
   | Bit 6 |   Select Pulse Waveform, 1 = On                      |
   | Bit 5 |   Select Sawtooth Waveform, 1 = On                   |
   | Bit 4 |   Select Triangle Waveform, 1 = On                   |
   | Bit 3 |   Test Bit: 1 = Disa