Koala Sampler's New Stem Splitter: Just How Much Better Is It?

15 hours ago

5 min read

Koala Sampler has become one of my favorite ways to make music on an iPad, and one of the things I've always appreciated about it is how much functionality has been added over the years. The latest update introduces a new high-quality stem splitter, promising cleaner separation when breaking a finished song into individual instruments.

Koala has actually had stem separation for quite some time, but the original version always felt like something I could use in a pinch rather than a tool I'd rely on for clean results. It worked, but there was often noticeable artifacting, unwanted sounds bleeding between stems, and that strange watery quality that can make separated audio difficult to use.

Meanwhile, Logic Pro has become my preferred tool for stem separation. I've used it extensively when rearranging songs, extracting individual parts, and even turning performances from hardware samplers into material I can develop further in the DAW.

With Koala's new update, I wanted to find out whether the improvements were substantial enough to change that workflow.

Comparing Koala Sampler's "Split Stems" Original, High-Quality, and Logic Pro Stem Splitter

https://youtu.be/BRzpx6H82mo

Watch the full comparison of the Drums, Vocals, Bass and Melodic Stems from Koala Sampler and Logic Pro here

For this comparison, I used four bars from my song Farther, taken from my album Radiant Visage. The section includes drums, bass, vocals, and melodic instruments, making it a useful test for the four categories Koala separates audio into.

I compared three different versions of the same recording: Koala's original stem splitter, its new high-quality option, and Logic Pro's Stem Splitter. Using my own music also meant I could listen to the original recordings of the individual instruments rather than simply guessing what each separated stem should sound like.

Drum Separation: Better... But Not Without Issues

The first comparison was the drums, and the biggest issue with Koala's original splitter became apparent almost immediately. Alongside the drum performance, I could hear a high-frequency transient from one of the guitar parts bleeding into the separation.

The interesting thing was that the software seemed to interpret the attack of the guitar pick as something percussion-related, almost like a hi-hat. Listening to the original guitar recording made it much easier to identify exactly what Koala was mistakenly including in the drum stem.

The new high-quality splitter handled this considerably better. The guitar transient was still audible though, particularly when the snare hit, but it was no longer present throughout the drum performance in quite the same way. The overall result sounded cleaner and more focused on the actual drums.

Logic Pro performed best in this particular test. There was no audible guitar bleed, and it seemed to retain more of the ride cymbal without pulling in as much unrelated material.

What stood out to me wasn't simply that one version sounded cleaner than another, but how differently the algorithms interpreted the same sound. A sharp guitar attack can share some characteristics with percussion, and the results demonstrate how difficult it can be for stem separation software to identify an instrument based on its role in a finished mix.

Vocal Separation: A Much Bigger Improvement for Koala Sampler Stem Splitter

The vocal comparison was particularly interesting because Farther contains several layers of vocals, including harmonies and quieter parts buried within the arrangement. Those details can be challenging for a stem splitter because the software needs to identify sounds that aren't necessarily prominent in the mix.

Koala's original splitter struggled here. The vocals were recognizable, but there was noticeable phasing, pumping, and a watery quality that made the result sound heavily processed. Some of the quieter harmonies were present, but they didn't come through particularly naturally.

The high-quality version was a substantial improvement. The vocals sounded clearer, more of the performance came through, and the artifacts were considerably less distracting. It was one of those comparisons where the difference was immediately apparent without needing to listen particularly closely.

There was still a tradeoff, though. The new version seemed to capture more of the surrounding synth material along with the vocals, so while the vocal performance itself sounded better, the separation wasn't necessarily as isolated as I would have liked.

Logic Pro again produced an impressively clean result, with less obvious artifacting and better separation of some of the backing harmonies. However, it wasn't perfect either. One backing vocal phrase lost part of a word, demonstrating that even a cleaner separation can come at the expense of musical information.

Why This Update Matters for iPad Beatmaking

What makes Koala's update particularly useful isn't necessarily that it can outperform Logic Pro. It's that the new splitter exists inside an app already built around sampling, chopping, sequencing, and resampling.

If I'm making a beat in Koala, being able to separate a song and immediately start working with the individual parts removes an entire step from the process. I don't need to move the recording into another application, separate it there, export the results, and then bring everything back into my sampler.

That kind of convenience has real creative value, especially when I'm experimenting with ideas rather than working toward a specific finished arrangement.

The better the separation becomes, the less often I need to interrupt that process. I can pull out a drum groove, experiment with a vocal phrase, or isolate a melodic part while staying inside the same environment where I'm making music.

For me, that's the biggest appeal of this update. It makes an already useful sampling workflow more capable without requiring a completely different way of working.

Is Koala's High-Quality Stem Splitter Worth Using?

Based on the drum and vocal comparisons, Koala's new high-quality stem splitter is a meaningful improvement over the original. The reduced artifacting is particularly noticeable on vocals, while the drum separation does a better job of keeping unwanted guitar transients out of the result.

Logic Pro still performed better in several of the areas I tested, especially when it came to isolating instruments more cleanly. However, Logic wasn't flawless, and its cleaner results occasionally came with their own compromises.

I wouldn't look at this update as a reason to abandon a DAW if you already rely on one for detailed editing and arrangement. Instead, I see it as another example of how capable Koala has become as a standalone music-making environment.

For anyone who primarily uses Koala to make beats, experiment with samples, or work away from a traditional studio setup, cleaner stem separation is a genuinely useful addition. It doesn't need to be the best separation algorithm available to make the creative process better.

And ultimately, that's what matters most to me. The less time I spend moving audio between different applications, the more time I can spend actually making something with it.