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C01A: The loading tune's variables
Set by LOADING_TUNE and the player. On the tape, the pointers hold where the tune had got to when the tape was made; LOADING_TUNE sets them from TUNE_VOICES before it plays.
VOICE_ONE_NOTE C01A DEFB $02 Voice one's note, from TUNE_NEXT_NOTE
VOICE_TWO_NOTE C01B DEFB $29 Voice two's
TUNE_PORT C01C DEFB $00 What both voices send to port $FE before they toggle the speaker bit: 0, the border black
VOICE_ONE_AT C01D DEFW $C11A,$C290 Voice one: the byte before its next note, and where it goes back to at its end
VOICE_TWO_AT C021 DEFW $C2BE,$C434 Voice two: the same
NOTE_LENGTH C025 DEFB $EE A note lasts 256 less this ($EE: 18) passes of 256 turns of the player's loop
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