Songs, loops & arrangement

ARC-24 organizes your work in three layers:

Layer	What it is
Song	Your project: name, tempo, sample pad pool, all loops, and arrangement
Loop	One section you can edit: length, key, recordings, sounds, and mix
Section	Part of an arrangement — picks a loop and how many times it plays

Saving and loading songs

Open the song list (header icon):

Action	What it does
Save	Saves the current song (save or save-as first if it's new)
Save As	Saves a copy under a new name
New	Starts a blank song
Load	Opens a different song
Delete	Removes a song
Rename	Tap the song title in the header (when the song is saved)

Songs sync through iCloud when you're signed in with the same Apple ID and iCloud Drive is on. Otherwise they're stored on your device.

ARC-24 does not watch iCloud in the background. The song list refreshes from disk when you:

Open the song list
Return to the app after it was in the background

Give iCloud a moment to download new files on a second device, then open the song list (or reopen the app) to see them.

Song list sheet with Save, New, and at least two songs in list.

Loop pill (header)

When a song is saved, a loop pill appears under the song title showing the active loop name.

Tap it to:

Switch loops for editing (stops playback)
Duplicate a loop
Create a new loop
Open Loop Manager to rename, delete, or reorder loops

Loop pill menu open showing loop names and Manage option.

Loop Manager

From the loop pill, open Loop Manager to:

Rename loops
Delete loops (this removes that loop's recordings and settings)
Reorder loops in the list

Each loop is independent — it can have its own length, key, recordings, per-track drum kits, mixer settings, and per-track instrument (Synth / Sample / Drums) and Keys settings.

Sample audio files are shared across all loops. Duplicating a loop copies its recordings, not duplicate WAV files.

Loop Manager sheet listing multiple loops with edit controls.

Creating a new loop

From the loop pill → New Loop:

Enter a name (or accept the suggested name)
You get a fresh loop (default length, no recordings yet)
Build it up with new parts and sounds

Arrangement

Open Arrange from the song list to build a longer piece from your loops.

Sections

Each row in the arrangement is a section:

Loop picker — which loop plays in this section
Repeat count — ×1, ×2, ×3, or ×4 (total bars = repeats × loop length)
Drag handle — drag to change the order

Play Arrangement

Tap Play Arrangement to hear the full timeline from start to finish. This is separate from pressing Play on the main performance screen (which loops one scene).