KORG M3 - Manual (Page 196)

Drum Track function
188
4. Select a Drum Track pattern. Use “Pattern Bank”
to select the preset or user bank, and use “Pattern
No.” to select the pattern number.
Note: If you select an empty pattern, you won’t be able
to turn the DRUM TRACK ON/OFF switch on.
5. Press the DRUM TRACK ON/OFF switch to verify
that the pattern sounds correctly.
The method of triggering will depend on the Trigger
settings. If Trigger Mode is Start Immediately, the
Drum Track pattern will start when you press the ON/
OFF switch. For details on the Trigger settings, please
see “Trigger settings for the Drum Track pattern” on
page 189).