Routines
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B6B9: Shuttling block, east-west (type 54)
The block_ew block (block_ew). Sets up shuttle_block to work on X and dX.
upd_54 B6B9 CALL sound_pitch_from_x sound pitched by X
B6BC LD HL,$0109 H = 1 (X), L = 9 (dX)
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