Yamaha DX7s Owner's Manual page 20

Selecting the Cartridge Voice Memories
As explained on page 6, the DX7s ROM cartridge contains several banks. To hear the
cartridge voices, make sure that the Voice/Performance bank is set to bank 2 of the ROM
cartridge (see page 7 for instructions on how to change the cartridge banks).
The LCD display will show
the number and name of
the selected Voice memory.
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