Koala Sampler is a fast, hands-on sampling app for iOS and Android that lets you record any sound, chop it across pads and turn it into a beat in minutes. This guide shows you how to sample, sequence, add effects and resample, so you can go from a random noise to a finished groove without overthinking it.
What makes Koala Sampler special
Koala strips sampling down to its most fun, immediate form. You record a sound straight into a pad, slice it, play it musically across a pad grid, and sequence it, all in one screen. It runs on both iPhone/iPad and Android, so almost anyone can use it. It is a favourite for lo-fi, hip-hop and experimental producers who like to build tracks from found sounds. If you are exploring this style of music-making, see our roundup of the best sampling apps.
Step 1: Record a sample
Tap a pad and record using the device mic, a connected interface, or audio from your library. You can sample anything: a chord on a keyboard, a vocal phrase, a vinyl loop, or a household sound. Keep the recording short and trim the start and end so the sample triggers tightly when you tap the pad. For cleaner captures on a phone, see how to reduce noise when recording on a phone.
Step 2: Chop the sample across pads
The real magic is slicing. Take a longer sample, such as a drum loop or a melodic phrase, and use the slice feature to chop it into pieces spread across the pads. Now each pad triggers a different slice, so you can replay the loop in a new order and create something fresh from the original. If you prefer pre-made kits over chopping your own breaks, the best drum machine apps for phones pair nicely with this kind of workflow. Try:
- Slicing a drum break and rebuilding the groove in a different pattern.
- Chopping a vocal so you can stutter and rearrange words.
- Slicing a chord loop to play the chords in a new sequence.
If your slices fall in the wrong place, most loops sit more cleanly when you set the tempo or bar length before slicing, so Koala can divide the audio into even beats rather than guessing. A four-bar drum loop chopped into sixteen slices, for example, lands one slice per sixteenth note, which makes rebuilding a groove far more predictable.
Step 3: Play it musically
Koala can pitch a sample across the pads so one sound becomes a playable instrument. Switch a pad to keyboard or pitch mode and you can play melodies and basslines from a single recorded note. This is how you turn one sampled sound into multiple instruments in a track. A single piano note can become a full chord progression, and a short bass pluck can become a melodic bassline, all from one recording.
Step 4: Sequence a beat
Use the built-in sequencer to record or program a pattern. Hit record and tap pads in time, or step-program the hits. Layer a drum pattern, a bassline and a melodic part on top of each other. Quantise to tighten the timing if your taps drift. For genre starting points, our guides on making lo-fi on your phone and making trap beats on your phone pair well with Koala’s workflow.
Step 5: Add effects
Koala includes a generous set of effects you can apply per pad or across the whole mix, including filters, reverb, delay, distortion and more. Use them to glue sounds together or to mangle a sample into something new. A low-pass filter and a touch of reverb instantly push a sample into lo-fi territory. For broader technique, see how to add effects in mobile music apps.
Step 6: Resample to build complexity
Resampling is a powerful trick: record your current pattern (with effects) back into a new pad, then chop and rework that. This lets you layer ideas far beyond the original pad count and create dense, evolving tracks. Build a loop, resample it, add a new layer, and repeat.
Step 7: Export your track
When you have a loop or arrangement you like, export the audio to share it or to finish it in another app. You can bounce the full mix, and in many cases move stems into a DAW where you can mix the song on your phone for a more polished result. See how to export a song from a music app for options.
How to choose your first sample
The fastest way to get a track moving in Koala is to start with the right raw material, and that matters more than any single feature. When you are deciding what to record, keep three things in mind:
- Pick something with character. A sample with a bit of texture, a vinyl crackle, a room tone, a slightly detuned note, gives you more to work with than a clean, sterile sound. Imperfection is what makes sampled music feel human.
- Keep it musical or rhythmic. A single sustained chord is easy to pitch across the pads, and a tight drum loop is easy to slice. Both give you an obvious next step, which keeps your momentum up.
- Record in a quiet, controlled space. Background noise, fan hum or traffic gets baked into the sample and follows it through every chop and effect. A few seconds spent finding a quiet spot saves a lot of cleanup later.
When in doubt, sample something you already find pleasing on its own. If the raw sound makes you want to keep listening, it will usually carry a whole loop.
Common mistakes to avoid
Most frustration with Koala comes from a handful of avoidable habits rather than the app itself. Watch out for these:
- Recording samples that are too long. A loose, ten-second clip is hard to trigger tightly and eats your focus. Capture the part you actually want and trim hard.
- Skipping the trim and tempo step. Slicing before you set the loop length leaves slices that drift off the beat. A few seconds of setup makes everything that follows feel locked in.
- Stacking effects to fix a weak sample. Reverb and distortion cannot rescue a muddy or noisy recording. Start with a clean, characterful source and the effects become seasoning rather than a rescue mission.
- Forgetting to resample. If your track feels thin, the answer is often to commit a layer by resampling it, which frees up pads and lets you build on top instead of fighting for space.
Frequently asked questions
Is Koala Sampler on Android and iOS?
Yes. Koala runs on both Android and iOS/iPadOS, which makes it one of the most accessible sampling apps regardless of your device.
Can I use Koala Sampler inside another app?
On iOS, Koala can run as an AUv3 plugin inside hosts like AUM, Cubasis or other AUv3-compatible apps, so you can sequence it alongside your other instruments. Read what AUv3 apps are to understand how that works.
Do I need any extra gear?
No. The built-in mic and your library are enough to start. An audio interface or external mic improves the quality of what you sample, and headphones help you hear detail while you chop.
Why does my sliced loop sound out of time?
This usually happens when the tempo or loop length was not set before slicing, so the slice points do not line up with the beats. Trim the sample to a clean loop, set the correct bar length, then re-slice, and the pads should fall neatly on each beat.
How do I make a sample sound more lo-fi?
Roll off the high end with a low-pass filter, add a little reverb for space, and consider resampling the result to soften it further. Slightly imperfect, slightly degraded sounds are the heart of the lo-fi aesthetic, so do not over-clean your source.
