Yamaha QY 300 Owner's Manual page 66

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Select the Disk Mode, Select "Load" & "All Data"
The data disk supplied with the QY300 contains a single "All Data" format file
which include 1 demo song and 100 styles x 8 sections (800 patterns). Press
the [DISK] mode key to select the DISK mode, press the [F2] function key
("Load."), then use the cursor keys, the [-1/NO] and [+1/YES] keys, or the
data dial to select "All Data".
Press [ENTER] & Select the "DEMO" File
Press the [ENTER] key top go to the load all data display, then use the cursor
keys, the [-1/NO] and [+1/YES] keys, or the data dial to select the "DEMO"
file.
Press [ENTER]
Press the [ENTER] key to execute the load operation. The QY300 will display
a confirmation prompt asking you if you're sure you want to delete all previ-
ous data in memory.
Press [+1/YES] to Confirm & Load the Data
Press [+1/YES] if you want to go ahead with the load operation, or [-1/NO] if
you want to cancel the load operation. If you choose [+1/YES], an "Execut-
ing" bar graph will appear while the data is being loaded.