I want to use the unit with a DJ application other than Serato DJ Pro by assigning MIDI. Where can I find the related information?

The MIDI message list is available [here].

When Serato DJ Pro is running, the unit can be used as a controller suitable for the Serato DJ Pro features.

However, you can change the setting to use the unit as a general MIDI controller regardless of whether Serato DJ Pro is running.

For details, refer to the Operating Instructions > [Changing the settings] > [Utilities mode].

You can read the Operating Instructions [here].