Live performance and looping

Here's a two-bar beat on loop. The person who recorded it hit the button exactly on the next downbeat, so the loop closes perfectly and you can't hear where it starts again.

Now the same beat, but the loop button went down a fraction late, a quarter of a beat after the downbeat. Before you play it: once you add more layers on top, will the stumble get better or worse?

That little trip comes back every single time. And it won't get better with layers, because every overdub you record will be the same slightly-too-long length. The first loop you close becomes the frame that everything after it has to fit. That's why great loopers obsess over one moment: the press that closes the first loop.

Why looping is its own kind of performance

Watch KT Tunstall build "Black Horse and the Cherry Tree" alone on stage with a loop pedal, or Ed Sheeran stack a song from a few taps on his guitar, and the magic is that you see the song being built. A rhythm, then a bass line, then a harmony, each one recorded live and played back underneath the next.

The pedal makes it look easy. The hard part is invisible: every layer is only as good as the first loop's timing, and once a layer is in, it's in.

Rehearse the close before you record

A loop has one start and one end, and the end jumps back to the start. You can practise that join without any gear.

Tap a two-bar phrase on the table and count out loud. At the end, go straight back to beat one without pausing or rushing. Do it ten times. Most people find they either cut the last beat short or hang on it a moment. Notice which you do.

On a looper, close the loop as you play the next "one", not when you hear it. If you wait until you hear the downbeat, you'll be late by your own reaction time, which is the quarter-beat stumble you just heard. Practise the press as part of the music, like a drummer's last hit.

The first layer should be simple

Make your first loop something with a clear pulse: a muted strum, a bass note on each beat, a sparse beatbox. If the frame is off, a simple rhythm makes it obvious immediately. A lush pad hides a bad join until the second layer drags it into the light.

Let the first loop play alone for a few passes. Can you count it without stretching the last beat? If not, clear it and go again. It's a five-second fix now and an unrecoverable mess after five layers.

Give each layer a different job

An overdub is a new layer recorded over the playing loop. The best overdubs do something the loop isn't already doing: answer on the off-beat, hold a long note over a busy rhythm, add a high part above a low one.

If two layers sit in the same register and hit on the same beats, the loop gets louder without getting clearer. Before recording a layer, play it live over the loop for two passes. If it doesn't have an obvious job, it doesn't need to be in the loop. Some of your best ideas belong on top, played live, so they can change every time.

Same idea, different place: a looper is a delay with a very long time and the feedback turned all the way up. Turn the feedback here almost to maximum and listen to every hit stack on the last, the way overdubs build. See Delay and echo.

Loops and clocks drift apart

A looper records its own length. A drum machine or DAW runs its own clock. Unless they're synced, they don't know about each other.

Say your two-bar loop at 120 BPM should be exactly 4 seconds and you closed it at 4.1. Against a drum machine it starts together, then slips a tenth of a second each pass. After ten passes it's a full second out: two whole beats. It doesn't break suddenly; it drifts until it's unmistakably wrong.

For your first performances, keep one timekeeper: make the first loop the clock and play everything else to it. Once you add a drum machine, check whether your looper actually follows its tempo before trusting it on stage. A tempo number on a screen doesn't prove they're locked together.

One expressive move at a time

A loop repeats; your performance shouldn't. The simplest way to make it breathe is one control you move on purpose: a filter that opens on the return, a level that drops for a quiet verse, a little more reverb on the last pass.

Choose one move and rehearse it at full volume. A sweep that sounds gentle while practising quietly can jump out once the whole loop is playing.

When the loop gets crowded

Looping is addictive. Every pass, there's room for one more layer, and suddenly every gap is filled and nothing stands out. Many loopers can't remove a single layer once it's in, so restraint is a skill.

Silence is your best move. Mute the loop for a bar and let one live part play alone. Drop to just the first layer for a verse. End by stopping everything except the voice. Audiences feel change more than they feel density.

Make it yours

Write a short score before you press record, and give every step a way out if it goes wrong. Fill in the sheet below.

A good starting score: count in; record two bars of something simple; listen for two passes; add one layer with a different job; play a live part over the top and finish with a deliberate stop. Perform it twice. Record the result with your phone or an audio recorder if you want to keep it: many loopers forget everything when you switch them off.

Quick check

1. Your loop has a tiny hiccup at the join. You add a pad on top to smooth it over. Does it help? No. The pad is recorded into the same too-long frame, so the hiccup is now in two layers. Clear and close the first loop again.
2. Your loop and drum machine start together but are clearly apart after a minute. What's going on? The loop's length and the drum machine's bars aren't the same, so the difference adds up every pass. Sync them, or let one be the clock and play the other to it.
3. Every new layer makes the loop louder but not more exciting. What should you try? Give the next layer a different job (register, rhythm or role) or take something away. Silence and contrast do more than one more layer.

Next steps

• Go deeper: Chords and harmony in performance. Your hands are busy keeping the loop going. How do you play full chords with one hand, or a few pads?
• Sideways: Playing with a model live. A looper only plays back what you gave it. What changes when the other part on stage is a model that answers you, a beat or a bar later?
• Use it: Form and arrangement. Turn repeating layers into sections, builds and returns.