Chopping a sample means slicing a longer piece of audio into smaller sections and assigning each one to its own pad, so you can trigger, reorder, and rearrange pieces of the original recording. Here's how to do it on an iPad.
What You Need
- An iPad with a sampler app that includes a chop or slice mode
- A source sample: an imported audio file, a recorded loop, or your own voice memo
- A little patience for the first few slices while you get a feel for placement
Step 1: Import or Record Your Source Audio
Bring in the audio you want to chop, either by importing a file or recording directly into the app. A recording with clear rhythmic or phrase-based structure (a drum break, a vocal line, an instrument riff) chops more predictably than something with no obvious internal structure.
Step 2: Preview the Full Source First
Before slicing anything, listen through the whole source once. This helps you identify natural chop points: where a word starts, where a drum hit lands, where a musical phrase resolves.
Step 3: Mark Your First Slice
Most chop workflows work by tapping an empty pad to arm a slice start, then tapping again (either on the same pad or another empty one) to mark where that slice ends. The audio between those two points becomes the content of that pad.
Step 4: Keep Slicing Across Multiple Pads
Continue marking start and end points across the rest of the source, building up a set of pads that each hold a different section. Related sections (consecutive drum hits, sequential syllables) are easier to work with later if you keep them in a predictable pad order.
Step 5: Trigger and Rearrange
Once slices are assigned to pads, you can trigger them in any order, at any rhythm, which is the entire point of chopping: turning one fixed recording into a flexible set of building blocks you control.
Step 6: Record Your Chopped Performance
Play the chopped pads as part of a loop, recording hits the same way you would with a drum machine or synth track, so the rearranged sample becomes part of the finished song.
A Few Practical Tips
- Chop on clear transients (the start of a hit or word) rather than in the middle of a sound, or playback will sound cut off
- Keep the original, unchopped source in the project in case you want to grab a different slice later
- If a slice loops when triggered, make sure its start and end points don't create an audible click or pop
ARC-24's Chop mode works this way: tap a loaded sample to loop-preview it, then tap empty pads to arm and commit slices from that source, with all slices sharing the original file so nothing gets duplicated on disk. It sits alongside six synth tracks, a drum machine, and a full mixer on iPad and iPhone. Learn more at arc24.app.
FAQ
What does "chopping" a sample mean?
Chopping means slicing a longer audio recording into smaller sections and assigning each section to its own pad, so you can trigger pieces of the original recording independently and in any order.
What kind of audio chops well?
Anything with clear internal structure: drum breaks, vocal phrases, instrument riffs with distinct notes or hits. Audio with no clear transients or phrasing is harder to slice into useful, distinct pieces.
Do I need to duplicate the audio file for each slice?
Not in apps designed for this: slices typically reference the same source file with different trim points, rather than creating a separate copy for every pad.
Can I chop a sample I recorded myself, not just an imported file?
Yes. Anything you can get into the app as audio, whether imported or recorded live through the mic, can be chopped the same way.