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97EA: Reset sound data and wait for FIRE key press
Used by the routines at 9C76 and A7CE.
97EA CALL $D5D7 Reset sound volume channels
97ED CALL $A477 Check for FIRE key pressed
97F0 JP NZ,$97ED Jump back until keypressed
97F3 CALL $A477 Check for FIRE key pressed
97F6 JP Z,$97F3 Jump back until key released
97F9 CALL $D5AE Reset sound data buffer
97FC RET
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