Undo and redo in Loop by Zaweba: 100 steps for every edit
Ctrl+Z undoes and Ctrl+Y redoes every edit in Loop by Zaweba, with 100 steps of history, so you can try bold ideas and step back safely.
Good music comes from trying things that might not work. Delete the bass for the first verse, double the tempo of the hats, move the chorus earlier, push the reverb much too far to hear what it does. That is only comfortable if you can get back to where you were. In Loop by Zaweba, Ctrl+Z undoes and Ctrl+Y redoes, for every edit, with 100 steps of history.
What counts as an edit
Every change to the song can be undone. That includes arranging on the grid (dropping a loop, moving or copying a clip, stretching it to repeat, deleting it), editing notes in the piano roll or the riff editor, changes from the clip right-click menu such as mute and key lock, and settings in the instruments, mixer, effects and automation lanes. If you changed the song, Ctrl+Z can take it back.
A hundred steps
A hundred steps is a lot of room. It covers a good stretch of work, so you can follow an idea for a while and still back out of it entirely. Each press of Ctrl+Z goes back one step; each press of Ctrl+Y goes forward again, as long as you haven't made a new edit in between. Making a fresh change after undoing starts a new path, and the steps you undid can no longer be redone.
Using undo as a comparison tool
Undo and redo make a handy A and B switch. Make a change, say a different chord in the second bar. Play the section with the loop region on (L). Press Ctrl+Z to hear it without the change, Ctrl+Y to hear it with. Your ears decide in seconds which is better.
This works for mixing too. Change the compressor on the drums, then flick back and forth with undo and redo while the loop plays.
Undo and saving
Undo is about edits during a session. Saving is separate. Ctrl+S saves the song as a .zloop file, and Save as (Ctrl+Shift+S) makes a new copy. Saves are atomic, meaning a save completes fully or leaves the earlier file untouched, so a crash mid-save won't leave you with a broken song.
For a big change you might want to come back to much later, Save as a new file before you start. Undo is the quick safety net; a saved copy is the long-term one.
Habits that help
Make one change at a time and listen. If you change five things and then decide you preferred it before, undoing them one by one tells you which change caused the problem.
Don't be afraid of deleting. Removing a clip to hear the song without it is a fast way to judge whether it earns its place, and Ctrl+Z puts it straight back.
Where it sits in the app
Undo and redo are in the Edit menu alongside Delete and Duplicate (Ctrl+D), and they work in both Loop mode and Studio mode. F1 lists every shortcut if you forget a key.
Loop by Zaweba is meant to grow with you, from dragging loops to mixing a song. A generous undo is part of what makes it a safe place to learn: nothing you try is ever a mistake you can't take back.
