there are 4 free Expansion Packs, especially for PSR-SX models (African, Europe, Latin America, Oriental (.CPF format) and some more Packs in .PPF format):
https://usa.yamaha.com/products/musical_...ml#product-tabsHere is the Pack List with all contents (Voices, Styles, Multi Pads) of these 4 Packs:
https://usa.yamaha.com/files/download/other_assets/4/1279214/psrsx900_sx700_en_de_fr_es_precl_a0.pdfThere is also a free Vietnam Pack for PSR-SX (.CPF format):
https://vn.yamaha.com/vi/products/musica...ml#product-tabsHere is the Pack List of this Vietnam Pack:
https://vn.yamaha.com/files/download/other_assets/6/1279216/psrsx900_sx700_en_vi_precl_a0.pdfsource psr tutorial