Korg Sound on Sound Owner's Manual page 38

Formatting a memory card will erase the all of the data in the card.
Be sure to keep backup files of important data on a computer or
other external device.
CARDINFO
This page indicates the used space or free space in
the card expressed by recording time (in minutes).
U___:
The amount of used space is indicated in minutes.
F___:
The amount of free space is indicated in minutes.
IMPORT
The SOUND on SOUND can import files in the following formats. If
you want to import certain WAV or AIFF files later, you can store them
in the EXTAUDIO folder on a memory card that was formatted on the
recorder.
File format: WAV file, AIFF file
Fileʹs bit resolution: 16‐bit, 24‐bit
Sampling frequency: 44.1 kHz, 48 kHz, 88.2 kHz, 96 kHz
Number of characters in file name:
Up to the first eight (8) characters will be displayed.
Importing a file
1. Access the IMPORT page, select "EXECUTE," and then press the
button.
2. The unit displays the name of a WAV/AIFF file stored in the
EXTAUDIO folder.
3. Press the + or ‐ button to select the file you wish to import, then
press the button.
4. A confirmation message will appear. Press the
the import operation.
5. The selected WAV/AIFF file is loaded as a song. The import opera‐
tion may take some time, depending on the file format.
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button to begin