Routines
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B4D1: Footstep length
Used by the routine at footstep_pitch.
The number of waves is (X/2 + (256-Y)/2)/16, which over the floor of a room comes to between 3 and 12: longer as X grows and shorter as Y grows. Falls into toggle_audio_hw_xC.
footstep_length B4D1 LD A,(IX+$01) C = the number of waves
B4D4 SRL A
B4D6 LD C,A
B4D7 LD A,(IX+$02)
B4DA NEG
B4DC SRL A
B4DE ADD A,C
B4DF RRCA
B4E0 RRCA
B4E1 RRCA
B4E2 RRCA
B4E3 AND $0F
B4E5 LD C,A
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