CASIO CTK-550 (sound and styles demonstration) - YouTube
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CASIO CTK-550 (DEMO songs) part 2/3 - YouTube
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Amazon.com: MaxLLTo 6FT Extra Long 9V AC DC Power Adapter Supply for Casio CTK-550, CTK-551, CTK-601, CTK-611, CTK-615, CTK-620L Electrical Paino Keyboard : Musical Instruments
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