Yamaha synth( synthesizer, 신디, 키보드) history
https://usa.yamaha.com/products/contents/music_production/synth_chronology/index.html

https://uk.yamaha.com/en/products/music_production/synthesizers

https://en.wikipedia.org/wiki/Yamaha_Motif

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https://usa.yamaha.com/products/music_production/synthesizers/montage/specs.html
2001 - Motif
2003 - Motif ES
2005 - MO
2007 - MM

2007 - Motif XS
2010 - Motif XF
2011 - MOX
2012 - MX

2023 - MOXF

2016 - Montage
2018 - MODX

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Timeline of Motif series
https://en.wikipedia.org/wiki/Yamaha_Motif

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Stage Keyboards (무대 키보드)
https://usa.yamaha.com/products/music_production/stagekeyboards/index.html
    - 야마하 스테이지 피아노 시리즈
    - 전문 연주자용

1994 - P
1999 - S
2006 - CP
2019 - YC

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Arranger Workstations (편곡 워크스테이션) 
https://usa.yamaha.com/products/musical_instruments/keyboards/arranger_workstations/
    - 연주, 반주용, 
2013 - Tyros5 
2017 - Genos
2019 - PSR-SX (스피커 내장)