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A438: A short falling sweep
Used by the routine at WIZARD_FIRE.
Eight steps rather than sixteen, and the pitch complemented so it falls where SOUND_SWEEP_UP rises. About 14 milliseconds, and barely moving -- 520 to 556 Hz -- so it lands as a blip rather than a slide.
SOUND_SWEEP_DOWN A438 LD D,$08 Eight steps.
SOUND_SWEEP_DOWN_0 A43A LD A,D Complemented, so the pitch falls.
A43B CPL
A43C RLCA
A43D LD B,A
A43E CALL BEEP One short note.
A441 DEC D
A442 JR NZ,SOUND_SWEEP_DOWN_0
A444 RET
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