PSR-SX900/700 Owners Manual:
https://europe.yamaha.com/files/download/other_assets/1/1279261/psrsx900_sx700_en_om_a0.pdf
PSR-SX900/700 Data list:
https://europe.yamaha.com/files/download/other_assets/3/1279213/psrsx900_sx700_en_dl_a0.pdf
PSR-SX900/700 Reference Manual:
https://europe.yamaha.com/files/download/other_assets/7/1279207/psrsx900_sx700_en_rm_a0.pdf
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