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tracker_init:
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; setup initial ay-3-8910 values (this depends on song)
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; claer out $70-$90
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init_registers_to_zero:
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ldx #$20 ; init registers to zero
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lda #0
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init_loop:
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sta AY_REGS,X
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dex
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bpl init_loop
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lda #$38 ; ABC channels on
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sta AY_REGS+7 ; $07 mixer
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