Yamaha PortaTone PSR-640 Prosedur Langkah Demi Langkah - Halaman 17
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4) Turn the Data Dial to select a Registration Bank.
5) Press the [EXIT] button.
6) Press the round button in the 'REGISTRATION MEMORY' section
to make the green LED illuminate.
7) Press the desired gray 'REGISTRATION MEMORY' button [1] through [4]
to get the Registration to be used.
Owner's Manual, p. 62-64