Changes

PSG

2 bytes removed, 1 April
/* Bit 3 (Continue), Bit 1 (Alternate) and Bit 0 (Hold) */
When bit3 = 0, volume and direction at the end of a period are always 0.
When bit3 = 1, Bit 1 bit1 and Bit 0 bit0 determine what happens to volume and direction at the end of a period.
==== Algorithm ====
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