What a vision mixer actually means by cutting, taking and preview

Two rows of buttons, two different jobs

Walk into any gallery and the first thing you notice is a panel with two rows of identical buttons. The top row is usually called programme, the bottom row preview. Programme is what the audience is seeing right now, whether that is a television viewer or someone watching a stream at home. Preview is what will go out next. The operator selects a camera on the preview row, checks the shot on the monitor, and only then sends it to air.

This separation is the whole point of a switcher. It lets the operator prepare a close-up of the singer while the wide shot is still live, without anyone outside the room seeing the preparation. Nothing you do on preview is visible to the audience until you move it across.

New clients often assume the operator simply presses the camera they want. In practice, every shot is chosen, checked and then released, usually within a second or two.

• Programme: the live output the audience sees
• Preview: the shot lined up to go out next
• The operator never changes programme by accident

Cut, mix and wipe: how one shot becomes another

A cut is the instant change from one camera to another, with no transition. It is the workhorse of live music coverage, because it matches the beat and hides nothing. A mix, sometimes called a dissolve, blends one picture into the next over a short time. On a slow ballad a gentle mix can feel natural; on a fast chorus it tends to look sluggish.

A wipe moves one picture across the screen to reveal another. In live concert work it is used rarely, mostly for stylised opening sequences agreed beforehand. The technical director and the vision mixer operator usually settle which transitions are in play before the doors open, so that nobody is improvising a style mid-song.

When we plan a show we ask the organiser what the programme should feel like. A choir evening and a late festival set call for quite different pacing, and the choice of transition follows from that.

Tally lights and why performers care about them

A tally is the small red light on a camera that tells the camera operator and the performer that this camera is live. When the operator puts a camera on programme, its tally comes on. It is a simple signal, but it keeps a large crew coordinated without anyone speaking.

Camera operators use the tally to know when to hold a shot steady and when they are free to reframe. Performers sometimes use it too, glancing at the lit camera when they want to address the audience at home. Without tally, operators would have to guess whether their movement was being broadcast.

On festival stages we check every tally during line-up, before the first act. A light that fails to come on is a small fault in rehearsal and an obvious one on air, so it is one of the first things Callum and the crew test.

The technical director calls, the operator presses

In many productions two people share the cutting. The technical director calls the shots, naming the next camera aloud over the intercom, and the vision mixer operator presses the buttons. This division is common and sensible: the person looking at the whole picture is not also trying to hit the right key at speed.

A typical call sounds brief. The director says ready camera two, and the operator puts it on preview. Then take two, and the operator sends it to air. The word ready is a warning; the word take is the action. Keeping these two words distinct stops accidental cuts.

On smaller jobs one experienced person may do both. That is a decision made at planning, based on the number of cameras and the pace of the show, rather than something decided on the night.

• Ready: a warning that a change is coming
• Take: the cut itself
• Stand by: hold attention, nothing changes yet

Isolated feeds and why they matter later

Besides the main programme output, a gallery can record each camera separately. These are called isolated feeds, or isos. The programme recording captures only what the operator chose to send out, while the isos keep everything every camera saw, including shots that were never used.

This matters after the event. If an organiser later wants a highlights film, or a shot of a particular guest that was not on air, the isos are the raw material for it. Without them, the only record is the live cut, and any alternative edit would have to be built from that single stream.

Recording isos needs storage and planning, so it is worth deciding in advance whether you want them. We raise it at the start of every enquiry, because it affects the equipment list and the amount of data to be handled.

Putting the vocabulary to use before your event

Knowing these terms makes planning conversations easier. If you tell us you want mostly cuts, few mixes and isolated feeds recorded, we can plan the camera positions and the equipment without lengthy back and forth. It also helps when you review a rehearsal, because you can say precisely what felt wrong.

You do not need the jargon to work with us. Hannah and Callum will happily translate, and most organisers pick up the main words after a single run-through. What matters is that everyone in the room means the same thing when a word is spoken.

If a term in a quotation or technical sheet is unclear, ask. A gallery depends on shared language, and a few minutes of explanation before the event saves confusion during it.

Multi-camera switching rests on a small set of ideas: prepare on preview, release to programme, choose the transition to suit the music, and keep the whole crew informed by tally and intercom. None of it is mysterious once the words are clear. If you are planning a concert or festival stage and want to talk through how your show would be cut, get in touch and we will go through it in plain terms.