Open any serious video editor for the first time and the buttons speak a different language. Retime. Duck. Punch-in. Callout. Mask. LUT. None of these ideas is hard - every one is a plain action wearing a trade name it picked up in a broadcast suite decades ago.

Here is the translation table, why each word exists, and what changed in Zella for iPhone because of it.

Retime = change the speed

When an editor says retime, it means make the clip play faster or slower. Slower stretches the clip longer on the timeline, faster shortens it, and nothing gets cut off either way. The word survives because pro tools group speed with reverse and replay tricks under one panel. If a menu says Retime, read it as Speed.

An editing timeline: video clips, a zoom keyframe and an audio track below.

In Zella on iPhone the tool is simply called Speed, and the reverse and instant-replay controls sit under Reverse & Replay.

Anything a viewer has to read at speed should clear the W3C's minimum contrast guidance.

For the underlying concepts, Apple's Final Cut Pro user guide is a clear primer on levels, headroom, and why a mix that peaks correctly can still sound wrong.

Ducking = the music gets quieter while you talk

Audio engineers say the music ducks under the voice - it dips automatically whenever you speak and swells back in the gaps. It is the single highest-value audio setting a beginner can turn on, and it hides behind one of the trade's most opaque words.

Zella's toggle now says exactly what it does: "Music gets quieter when you talk." Nothing to decode. The same idea on the Mac still carries its pro name, Auto-Duck, where the audience expects it.

Punch-in = a zoom

A punch-in is a quick zoom toward the subject, usually on a strong word or at the start of a video. The name comes from physically punching in a tighter shot on a switcher. Every modern short uses them; nobody outside the trade calls them punch-ins.

Zella's automatic version is described as what it is - zooms on your strongest words, an opening zoom on your hook - both on the phone and in Auto-Polish.

Callout = an arrow or a label

A callout is anything you overlay to point at something: an arrow, a box, a spotlight, a number badge, a blur over a secret. The word is fine once you know it, and invisible if you do not - nobody searching a new app types callout.

On iPhone the tab is now named Arrows & Labels, and the Mac's narrower inspector went one word shorter - Arrows. The types live behind a word you would actually look for on both platforms (the Mac catalog has since grown a 20th, the corner-bracket Target frame), and the docs keep callouts as the concept's name so the trade term still finds it.

Mask = show only part of the clip

A mask hides everything outside a shape - an oval or a rectangle - so an effect or a clip only shows through that window. The concept is from film compositing; the everyday version is "blur just this corner" or "brighten only her face."

Zella's iPhone control is labelled Show part of the clip (mask) - the plain words first, the trade word in parentheses so you learn it as you go. That parenthesis pattern runs through the whole app: Custom color look (LUT) rather than LUT alone.

LUT = a color look in a file

A LUT (lookup table) is a color recipe saved as a .cube file - load one and your footage takes on that grade. Colorists trade them; apps sell them. The only thing a beginner needs to know is that it is a color look you can import.

Why we renamed the buttons, not just the docs

A glossary teaches the reader who finds it. A renamed button teaches everyone, on the spot, with zero reading. That is the bet Zella made across both apps in their beginner passes: every control is a labelled word rather than a bare icon (Export says Export), every jargon term either became plain English or carries its plain meaning in parentheses, deletes answer with the way back ("Deleted - tap Undo to bring it back"), and one-time tips point at the two gestures nobody discovers alone - trimming by the yellow edges, and dragging text on the video.

None of this removes depth. The pro vocabulary survives where it earns its keep - the Mac's audio tools still say Auto-Duck - and both apps now put plain words on the tabs, teaching the trade terms in passing. See the iOS editor guide for the full tour.

Beginner jargon FAQ

Is retiming the same as trimming? No. Trimming cuts material off the ends of a clip; retiming (speed) plays the same material faster or slower. Nothing is removed when you change speed.

Does ducking delete the quiet parts of the music? No. The music is only turned down while you speak, automatically, and comes back up in the gaps. The track itself is untouched.

Do I need LUTs as a beginner? No. Built-in color looks cover almost everyone. LUT import exists for the day someone hands you a .cube file and you want your footage to match their grade.

Where did the Callouts tab go on iPhone? It is named Arrows & Labels now (and simply Arrows on the Mac) - same types as before, same free tier, a name you can guess.