How to Use a DJ Mixer Send and Return for External Effects
To use send and return on a DJ mixer, connect the mixer's SEND (FX Send) output to your effects unit's input, then run the effects unit's output back into the mixer's RETURN (FX Return) input. You dial in how much of each channel feeds the effect using the channel SEND knob, then blend the wet, processed signal back into the master with the RETURN level. This lets you run pro outboard gear (delays, reverbs, filters) instead of relying only on the mixer's built-in FX.
That is the short version. Now let's go deep, because send and return is one of the most misunderstood features on club mixers, and getting it right is the difference between lush, controllable effects and a howling feedback mess in front of a full room.
What Send and Return Actually Does on a DJ Mixer
Most working DJs live inside their mixer's onboard FX or the software effects in Serato and rekordbox. Those are fine. But higher-end mixers (Pioneer DJM-900NXS2, DJM-A9, Allen & Heath Xone series, Rane Seventy) include an FX Send and Return loop so you can patch in dedicated hardware. Think a Korg Kaoss Pad, an EHX or Strymon delay pedal, a Roland Space Echo, an analog filter, or a rack reverb.
The concept comes straight from studio mixing. A send taps a copy of your audio and routes it out of the mixer. Your external box does its thing (adds echo, reverb, whatever), and the return brings that processed sound back in and mixes it with your original dry signal. Crucially, your main audio never physically passes through the effects box. Only a copy does. That means if the pedal glitches or you kill the send, the music keeps playing clean.
Send/Return vs Insert: know the difference
Some mixers offer an insert point instead of, or alongside, a send/return loop. An insert breaks the signal path and forces 100 percent of the audio through the external unit. That is useful for something like a compressor or EQ that you want on the whole signal, but it is risky live: if that gear fails, your sound drops out. For creative effects, send/return is almost always what you want because you stay in control of the wet/dry balance.
The Cabling: How to Physically Connect Send and Return
On the back (or top) of the mixer you will find jacks labeled SEND and RETURN, usually 1/4 inch TS or TRS. Here is the signal flow:
- Mixer SEND OUT goes to the INPUT of your effects unit.
- Effects unit OUTPUT goes back to the mixer RETURN IN.
- If your effect is stereo, use both L and R for send and return. If it is a mono pedal, use a single cable each way and set the return to mono if your mixer allows.
That is a loop: out of the mixer, through the box, back into the mixer. Get the direction wrong (send into the pedal's output, for example) and you will get silence or a weak, distorted signal.
Line level vs instrument level: the gotcha with guitar pedals
This trips up a lot of DJs who want to use cheap, characterful guitar pedals. DJ mixers send and return at line level. Guitar pedals expect instrument level, which is much hotter and lower impedance mismatch territory. Plug a line-level send straight into a delay pedal and you often get harsh clipping and a thin sound. The fix is a reamp box or a line/instrument level converter between the send and the pedal, then back up to line level into the return. Purpose-built DJ effects boxes (Kaoss Pad, Pioneer RMX-1000, Allen & Heath's own units) already run at line level and drop straight in.
Setting Levels: Gain Staging Your FX Loop
A clean send/return chain is all about matching levels so nothing clips and the wet signal sits right against the dry. Feedback and harshness almost always come from bad gain staging, not the effect itself.
- Start with the channel SEND knob down. Get the track playing clean on the master first.
- Bring the effects unit input to a healthy level. Watch its meters. Aim for the meters dancing in the upper-middle range, not pinning red.
- Set the effect's own dry/wet. For a send/return loop, you usually want the external box set to 100 percent wet, because the mixer is already providing the dry signal. Sending dry signal back through the return doubles it up and causes phase weirdness and volume jumps.
- Raise the RETURN level to taste. This is your master effect blend. It controls how loud the processed sound is in the overall mix.
- Ride the channel SEND to perform. Now you push the send knob up on whichever channel you want to feed into the effect, in real time.
If you are new to clean levels across the whole chain, it is worth reading up on how to set gain staging correctly to stop your DJ mix from clipping, because the same discipline applies to your FX loop. A hot send that clips the effects unit will ruin an otherwise beautiful reverb tail.
Pre-Fader vs Post-Fader Sends: Why It Matters
Better mixers let you choose whether the send taps the signal pre-fader or post-fader.
| Mode | What happens | Best for |
|---|---|---|
| Post-fader | The send follows the channel fader. Pull the fader down and the effect feed drops too. | Standard live use. Echo trails fade naturally as you close the channel. |
| Pre-fader | The send taps before the fader, so the effect keeps getting signal even when the fader is down. | Echo-out transitions: pull the fader to silence but let the delay tail ring on into the next track. |
The pre-fader trick is gold for transitions. You cut the original track dead, but a long delay or reverb tail carries over the gap, then the incoming track drops in underneath it. It is the same energy as an echo-out on the onboard FX, but with a much richer external unit doing the work.
Creative Ways to Use Send and Return Live
Echo throws on vocals
Feed an acappella or vocal-heavy track into an external delay via the send, time the delay to the beat (many units tap-tempo or sync to BPM), and throw a burst of echo on the last word of a phrase. Pull the send back down and the echo trails away on its own. This pairs beautifully with clean vocal versions. If you separate your tracks properly (here is how to tag vocal and instrumental versions in your record pool), you always have the right stem or edit ready to feed the effect.
Reverb washes for breakdowns
During a breakdown, gradually raise the send into a big plate or hall reverb. The track blooms into a wash of ambience, tension builds, then you cut the send and slam back to the dry drop. External reverbs almost always sound wider and more expensive than the onboard equivalent.
Analog filter sweeps
Patch an external filter (Xone filters, Sherman Filterbank, a Kaoss Pad) into the loop and sweep it live. This gives you a second, character-heavy filter on top of the mixer's own EQ. If you love working the crowd with sweeps, combine it with the techniques in this guide to use filter sweeps for smooth transitions between vocal tracks for a much bigger toolbox.
Layering with hot cues and edits
Send/return really shines when you stack it with performance edits. Chop a hook with hot cues, feed each stab into a delay, and you are building live remixes on the fly. The workflow overlaps heavily with how to use hot cues to create live remixes from record pool edits, and having clean, DJ-ready versions pulled from GreenHitz means your source material is already trimmed and loud enough to drive the effect properly.
Avoiding Feedback and Common Send/Return Mistakes
Feedback loops happen when processed signal from the return finds its way back into the send. The classic causes and fixes:
- Dry signal returning: set the external unit to fully wet, as covered above.
- Send routed to the same channel as the return: on some flexible mixers you can accidentally feed the return back out the send. Check your routing.
- Return level too hot with high feedback/regeneration: a delay set to high feedback plus a loud return can self-oscillate into a scream. Keep one hand on the return knob and be ready to pull it.
- Ground hum: if you get a low buzz, you may have a ground loop between the mixer and the effects box. A ground-lift adapter or a DI box solves most of it.
Before any gig, test the full loop at home. Learn exactly how far you can push the send before an effect gets unruly, and set your return so an accidental full send does not blow the roof off. Consistent source levels help here too; if your library volume jumps around, read why record pool tracks can have inconsistent loudness and how to fix it so a hot track does not overload the send mid-set.
Do You Even Need External Effects?
Honest answer: not always. If you are playing weddings and bar residencies, the onboard FX on a DJM or even a DDJ controller are plenty, and one less box to carry is a real advantage. Send/return earns its keep when you want a signature sound, when you play open-format or techno sets where effects are part of the performance, or when a specific piece of hardware (a Space Echo, a certain filter) is central to your style. For more workflow deep dives, browse the rest of the DJ guides and pick the tools that fit the rooms you actually play.
Frequently Asked Questions
Can I use guitar effects pedals with a DJ mixer send and return?
Yes, but not by plugging them straight in. DJ mixers run at line level and pedals expect instrument level, so you need a reamp box or level converter on the send side, then boost back to line level into the return. Without it you get thin, clipped, harsh sound. Set the pedal fully wet to avoid doubling the dry signal.
Why does my effects loop cause feedback or a loud squeal?
Feedback almost always means processed signal is looping back into the send. Set your external unit to 100 percent wet so no dry signal returns, keep the return level moderate, and watch delay feedback (regeneration) settings, since high feedback plus a hot return will self-oscillate. Check your routing so the return is not feeding the send.
What is the difference between send/return and an insert on a mixer?
A send/return taps a copy of the signal, processes it externally, and blends the wet result back in, so your main audio stays clean even if the gear fails. An insert forces 100 percent of the signal through the external device, breaking the path. Send/return is safer and more flexible for creative effects; inserts suit compressors or EQ on the full signal.
Should the external effect be set to fully wet or a mix?
Fully wet, in almost every case. In a send/return loop the mixer already carries the dry signal, and you blend the effect back with the return knob. If the external box also sends dry signal back, you double the dry audio, which causes phase issues and volume jumps. Set the unit 100 percent wet and let the mixer control the balance.
Does every DJ mixer have send and return?
No. It is a feature on higher-end club and battle mixers like the Pioneer DJM-900NXS2, DJM-A9, Allen & Heath Xone range and some Rane models. Entry-level controllers and two-channel mixers usually skip it and rely on onboard or software effects. Check your mixer's rear panel for jacks labeled SEND and RETURN before planning an outboard setup.
Can I use send and return for a transition instead of just effects?
Absolutely. Use a pre-fader send into a delay or reverb, cut the outgoing track's channel fader to silence, and the effect tail rings on to bridge the gap while the next track drops underneath. It creates a smooth, atmospheric handoff that sounds far bigger than a straight fader cut, especially on breakdowns and vocal endings.
