Equipment & software

DDJ-FLX4 beginner guide

The most common first controller, and its equally common predecessor. Here is what you have, what is different between them, and how to get from unboxing to a first mix.

Published 31 August 2026 · MixReady

Short answer. The DDJ-FLX4 is Pioneer DJ's two-channel entry controller and the successor to the DDJ-400, which was discontinued in late 2022. The main practical difference: the DDJ-400 was rekordbox-only, while the FLX4 works with both rekordbox and Serato, and adds some assistive one-knob features. Everything in this guide applies to both.

What you have

A two-channel controller: two decks with jog wheels, a two-channel mixer with three-band EQ and a filter, performance pads, and a built-in sound card that handles both the main output and headphone cueing. That is a complete DJ setup once you add headphones and a laptop.

The layout deliberately mirrors club hardware, which is the point — the muscle memory you build here transfers to CDJs later.

FLX4 versus the DDJ-400

	DDJ-400	DDJ-FLX4
Status	Discontinued (late 2022)	Current
Software	rekordbox only	rekordbox and Serato DJ
Assistive features	—	Smart Fader, Smart CFX
Mic in your recordings	No	Yes
Layout and feel	Near-identical two-channel design

If you already own a DDJ-400, do not upgrade yet. Nothing in the FLX4 will make you a better DJ. The one reason to move is wanting Serato — see rekordbox vs Serato.

Setting up

Install the software before plugging anything in — rekordbox, or Serato DJ if your unit supports it.
Connect by USB. The controller is also your sound card; no separate interface needed.
Set the audio output to the controller in the software's settings, and headphones to the controller's headphone socket.
Import and analyse your music. Do not skip analysis — it produces the BPM, key and beatgrid everything else depends on.
Check the beatgrids on anything with live drums before you trust sync.

Your first mix, in six steps

Load a track on deck 1 and play it through the main output.
Load a second on deck 2 and cue it in your headphones only.
Match the tempo — with the pitch fader by ear, or with sync while you are learning. See beatmatching by ear or sync.
Kill the bass on deck 2 before you bring it in — this one habit removes most beginner mud.
Start deck 2 on a downbeat, at the start of a phrase in deck 1. See bars and phrases.
Bring the fader up, swap the bass across, retire deck 1. That is a mix.

About the assistive features

Smart Fader and Smart CFX adjust tempo, level and effects automatically to smooth a transition. They are genuinely useful for a first evening and worth turning off soon after: they hide the relationship between what you do and what you hear, which is the thing you are trying to learn. Use them to get a first mix working, then switch them off and do it manually.

Where to go next

Set your cue points, learn EQ and filters properly, and when you are ready to play out, practise exporting to USB so the move to club gear is a formality.

FAQ

What is the difference between the DDJ-400 and the DDJ-FLX4?

The FLX4 replaced the DDJ-400, which was discontinued in late 2022. Physically they are very similar two-channel controllers. The most important difference is software: the DDJ-400 works with rekordbox only, while the FLX4 supports both rekordbox and Serato DJ. The FLX4 also adds mic routing into the main output and assistive features such as Smart Fader and Smart CFX.

Is the DDJ-FLX4 good for beginners?

Yes — it is one of the most widely recommended first controllers. It has the standard two-deck layout that mirrors club hardware, so the skills transfer, and it unlocks rekordbox's full performance mode and works with Serato DJ Lite, rather than a time-limited trial. Its assistive features are optional and can be ignored once you want to do things manually.

Should I buy a used DDJ-400 instead?

It is a reasonable way to save money, with one caveat: it is discontinued and rekordbox-only, so if you later want to use Serato you would need different hardware. If the price difference is small, the FLX4's dual-software support is worth having.

What equipment do you need? · rekordbox vs Serato · Beatmatching · How long it takes to learn