Follow this procedure:
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2CAQ2WAV -a -f11 -q Chess_BAS.CAQ
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sox chess_BAS_11Q.WAV chess_BAS_11Q.VOC
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direct chess_BAS_11Q.VOC chess_BAS_11Q.tzx
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2CAQ2WAV -a -f11 -q Chess_A.CAQ
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sox chess_A_11Q.WAV chess_A_11Q.VOC
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direct chess_A_11Q.VOC chess_A_11Q.tzx