Korg M1 Owner's Manual page 22

The Browser
6. Sound list
This area shows the combinations or programs that were
found. When you double-click a displayed name, that sound
will be selected and the browser will close.
If you've selected a sound in this list by clicking it, you can
send note-on messages from the on-screen keyboard or an
external MIDI device to play the sound selected in the browser
as well as the currently selected timbre (track) and any timbre
(track) that is set to the same MIDI channel. If the [SOLO] but-
ton (7.) is ON, only the sound selected in the list will be heard.
While you're selecting a sound in the browser, you
can't use a connected external MIDI device to edit the
sound (or perform automation or control changes).
7. SOLO button
This specifies how sounds will play when you're using the
browser.
ON: Only the program selected in the browser's sound list
will play. Use this setting if you want to hear only the pro-
gram you're searching for.
OFF: The timbre (track) selected by "Timbre Select" ("Track
Select") and any sound assigned to the same MIDI channel
will sound. Use this setting if you want to use multiple
sounds as a layer, and would like to hear the mix balance of
these sounds.
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8. CANCEL button
Closes the browser without applying the selected sound.
9. APPLY button
Applies the selected sound.
10. OK button
Applies the selected sound and closes the browser.
11. CLOSE button
Closes the browser.