No, a separate DJ mixer (e.g., DJM-S9) or DJ controller (e.g., DDJ-SX2) for which the Serato DJ software can be authenticated is required. Furthermore, you need to perform MIDI mapping for this unit yourself.

No, there is no need for an AC adapter.
This unit is only supported on USB bus power.

The default pad modes of DDJ-XP1 and DJM-S9 are as follows.

-DDJ-XP1
[HOT CUE] [PAD FX 1] [BEAT JUMP] [SAMPLER]
[KEYBOARD] [PAD FX 2] [BEAT LOOP] [KEYSHIFT]

-DJM-S9
[HOT CUE] [PAD FX 1] [SLICER] [SAMPLER]
[BEAT JUMP] [PAD FX 2] [SLICER LOOP] [SAMPLER ROLL]

With DDJ-XP1, you can customize the pad modes in Pad Editor. For details, refer to the Pad Editor Operation Guide of the rekordbox product site.
https://rekordbox.com/en/support/manual.php

This unit is designed so that it can be used as a general purpose MIDI controller.

No. MIDI signals are input and output through the USB port.

Operation is not guaranteed when the computer has been restarted from the standby or sleep mode.

Yes.
This unit can be used on the computer's bus power only.

Yes.
It can be obtained on the Pioneer DJ support page.

This unit can be used as a general-purpose MIDI controller so you can also use it with other DJ applications by performing MIDI mapping yourself.
For details on the MIDI assignment for each button and pad of the unit, check the Pioneer DJ site.
[Support] > [FIND SOFTWARE INFORMATION] > [DJ CONTROLLER] > [DDJ-XP1] > [MIDI-COMPATIBLE SOFTWARE] > [LIST OF MIDI MESSAGES]
Also, for information on the assignment procedure, refer to your DJ software's operating instructions.

For the latest information on the supported DJ application, see the support page.

Also, DDJ-XP1 can use as general purpose MIDI controller.
To use as a controller to operate DJ software other than rekordbox dj, be sure to execute the setting yourself.
For details, see your DJ software's operating instructions.

This unit has no sound card function or audio input/output terminals.

The REL mode is a mode to not reflect the CD or vinyl playback position on the playback position of a track when controlling track playback and pausing, playback speed, etc. from a control CD or vinyl. When using the hot cue or loop function of rekordbox dj, use the REL mode, not the ABS mode.
The INT mode is a mode for controlling track playback and pausing, playback speed, etc. without using a control CD or vinyl.

Using this button in combination with hot cues when rekordbox dvs is in the REL mode enables a method of use that is just like cue playback with CDJ.
The following is an example of using [SILENT CUE].
1. Set a hot cue at the desired location for cue playback.
2. Press the [SILENT CUE] button to set the track being played to the mute state.
3. Sets the pad mode to the hot cue mode.
4. Call out the hot cue set in step 1 at the desired location for cue playback.
5. Playback begins from the hot cue point. (Mute is canceled.)

Yes. If you press the [SHIFT] + [LOAD] buttons while the cursor focus is on the track list, the cursor focus will move to the next track down and that track will be loaded into the deck.

Use the key sync function after completing the key analysis of tracks in rekordbox.
Perform the key analysis of a track with the procedure below.
Select the track for which you wish to perform key analysis in the track list and then right-click, select [Analyze Track], select the [Key] check box in the Analysis Settings screen, and click [OK].

Use this function within one octave above or below the key of the original track.

It can be used as follows.
1. Set the state to keep an effect on even if you release your finger from the touch strip.
2. Fix the level/depth in advance without selecting an effect and then turn on the effect when it is selected.

Yes. By connecting this unit to the USB A terminal of the CDJ-2000NXS2, CDJ-TOUR1, or XDJ-1000MK2, you can control functions such as hot cue, auto beat loop, and beat jump of the player from the DDJ-XP1.

Yes. The setting can be configured in the utilities mode of the unit.

Yes.

Yes. The setting can be configured in the utilities mode of the unit.

MASTER TEMPO will turn on automatically for a performance with the pad mode in the KEYBOARD mode or when the key of the track is changed in the key shift mode.

A chord performance is not possible.

Yes. Quantize of Slide FX can be turned off by setting BPM mode of Beat FX in rekordbox dj to [TAP].

Multiple effects cannot be assigned to Slide FX.

It enables a performance with a pitch assigned for a hot cue. A pitch can be assigned to each pad to enable a melody to be played using the pads just like a keyboard.

The number of pads that can be displayed at one time is eight but the display can be switched using the [PAGE] button on the DDJ-XP1.

The original key can be restored by pressing the [SHIFT]+[SEMITONE+] buttons. (Key reset)

Use it as an emergency workaround measure in the event that playback in the REL mode or ABS mode cannot be continued due to some kind of accident during a performance using rekordbox dvs. In such a case, playback without using signals from a control CD or vinyl will be possible.

Set the playback mode of rekordbox dvs to the REL mode.

There are cases where the BPM becomes 1/2 or 2 times the BPM of the sync source.

Update rekordbox to the latest version.

The pad mode can be changed to a mode other than the default by using Pad Editor in rekordbox dj.

In PERFORMANCE MODE, the number of HOT CUE points that can be set for each track has been expanded to the 16 points A to P from rekordbox 5.0.
In EXPORT MODE, the number is still the 8 points A to H. Therefore, in the case of the HOT CUE points I to P set in PERFORMANCE MODE, they cannot be handled in EXPORT MODE, and also cannot be exported as data to external devices like CDJ or XDJ.

PAD EDITOR, a new function of rekordbox 5.0, can be used only when the DDJ-XP1 is connected via USB to a user's computer.