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B4C6: Footstep pitch
Used by the routine at audio_guard_wizard.
On alternate pairs of frames the pitch is replaced by one from the walker's height.
Input
A the frame counter, or its complement
B the fixed half-wave count
footstep_pitch B4C6 BIT 1,A keep the fixed pitch
B4C8 JR Z,footstep_length
B4CA LD A,(IX+$03) or take half the complement of Z
B4CD CPL
B4CE SRL A
B4D0 LD B,A
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