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PSG

10 bytes added, 1 April
/* Bit 1 (Alternate) and Bit 0 (Hold) */
When bit3 = 1, these 2 bits determine what happens to volume and direction at the end of a period.
volume = ~volume & 0x0F if !alternate
direction = 0 if hold else ~direction & 1 if alternate
Phi2x
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