$D40A/54282/SID+10:  Voice 2: Pulse Waveform Width - High-Nybble

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   | Bits 7-4 |   Unused                                          |
   | Bits 3-0 |   Voice 2: Pulse Waveform Width - High-Nybble     |
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   This register is write-only!

   See also: SID-Maths