$CF8C/53132: Change buffer
Jump from $CF51, $CF57, $CF6C:
CF8C: A6 82 LDX $82 ; channel number
CF8E: B5 A7 LDA $A7,X
CF90: 49 80 EOR #$80
CF92: 95 A7 STA $A7,X
CF94: B5 AE LDA $AE,X ; rotate bit 7 in table
CF96: 49 80 EOR #$80
CF98: 95 AE STA $AE,X
CF9A: 60 RTS
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