When Teenage Engineering first introduced their Pocket Operator line, the music world was fascinated by the idea of affordable, calculator-style devices that could actually produce serious beats and melodies. Among the range, one of the most talked-about units is the PO-33 K.O!, a micro-sampler and sequencer that manages to deliver genuine creative power despite its playful look. In this review, we’ll dive deep into the PO-33, exploring its features, workflow, strengths, limitations, and how it fits into a producer’s toolkit.
First Impressions and Design
At first glance, the PO-33 looks more like a quirky calculator than a serious music device. The exposed circuit board, compact size, and tiny LCD screen might make newcomers doubt its potential. Yet this is very much a deliberate design choice from Teenage Engineering. The minimalist build helps keep costs low, but it also gives the unit a unique, fun aesthetic that instantly stands out.
The PO-33 is small enough to fit in your pocket, powered by two AAA batteries, and light as a feather. You can literally throw it into your backpack and have a fully functional sampler with you anywhere. The screen features charming animated graphics that dance along with your beats, adding to the toy-like but endearing personality of the device.
Don’t be fooled by the looks though—the PO-33 is surprisingly deep once you start exploring its features.
Core Features
The PO-33 K.O! is all about sampling. While other Pocket Operators focus on drums, melodies, or noise, the PO-33 lets you capture and manipulate your own sounds, which instantly makes it more versatile. Here’s what it offers:
- 40 seconds of sample memory – Split across 16 sample slots, each with its own sonic identity.
- 8 melodic sample slots – For pitched samples, allowing you to play them chromatically across the keys.
- 8 drum slots – For percussive hits, loops, or chopped samples.
- 16-step sequencer – Build patterns quickly with intuitive step programming.
- Effects – 16 built-in effects such as filters, stutters, and bit-crushing add character to your sounds.
- Parameter locks – Automate changes per step for movement and complexity.
- Mic and line input – Sample directly using the built-in microphone or connect external gear via 3.5mm input.
- Sync capability – Chain with other Pocket Operators or external gear for larger setups.
This feature set makes the PO-33 incredibly powerful for its price. Sampling, sequencing, and effects in such a tiny form factor is something that even big-name samplers struggled to offer until recently.
Workflow and Usability
The PO-33 K.O! takes a bit of time to get used to. With just a few buttons and a small screen, Teenage Engineering had to be creative with how functions are accessed. Most controls involve holding down one button while pressing another, which means the first few hours can feel like learning a new language.
Once you’ve got the hang of it, though, the workflow becomes second nature. Sampling is as simple as holding the record button and either using the onboard mic or plugging in a source. You can chop, trim, and assign your samples to pads with surprising precision for such a small device.
The sequencer is straightforward—lay down drum patterns, add melodic notes, and then spice it up with effects or parameter locks. Copying and chaining patterns lets you build full songs despite the 16-step limitation.
One thing to note: because of its size, the PO-33 doesn’t have velocity-sensitive pads. Everything is either on or off, which means dynamics must come from your sample selection and programming rather than finger drumming.
Sound Quality
For a pocket sampler under £100/$100, you might expect low-grade audio. Surprisingly, the PO-33 sounds great. Samples are recorded in 8-bit/32kHz, which gives them a gritty, lo-fi character. This lo-fi aesthetic is actually part of the charm—perfect for hip-hop beats, lo-fi house, vaporwave, or experimental electronica.
If you’re looking for pristine, studio-grade sound, you won’t find it here. But if you love crunchy drums, dusty textures, and characterful imperfections, the PO-33 is a dream. The effects enhance this even further, with filters, distortion, and stutters adding creative flair.
Creative Potential
Where the PO-33 K.O! really shines is in its ability to spark creativity. Its limitations force you to think differently about sampling and sequencing. Instead of drowning in endless features, you’re working with 40 seconds of memory, 16 steps, and a handful of effects. That constraint can be incredibly freeing.
Many producers use the PO-33 as a sketchpad—a way to capture ideas on the go. Others integrate it into larger setups, using it for unique sample textures that can’t easily be replicated with software. It can also be a fantastic tool for live performance, especially when chained with other Pocket Operators like the PO-12 Rhythm or PO-20 Arcade.
Teenage Engineering has always designed their instruments to be fun first, and the PO-33 nails that philosophy. You’ll find yourself sampling everyday sounds—keys jingling, people talking, ambient street noise—and turning them into beats in minutes.
Strengths
- Portability – Truly pocket-sized, battery-powered, and ready to go anywhere.
- Sampling power – For the price, the ability to record and manipulate samples is outstanding.
- Creative effects – Adds personality and variation without external gear.
- Value for money – One of the cheapest samplers on the market, yet capable of professional results.
- Fun factor – The playful design encourages experimentation and creativity.
Limitations
Of course, the PO-33 isn’t perfect. Here are some drawbacks to keep in mind:
- Memory limits – 40 seconds total means you need to be efficient with your samples.
- Learning curve – The button combos take practice to master.
- Build quality – While charming, the exposed circuit board design makes it fragile compared to sturdier gear.
- No velocity sensitivity – Lacks dynamic pads, which limits expressive playing.
- Lo-fi sound – Great for certain genres, but not ideal if you want clean, high-fidelity recordings.
Comparisons with Other Pocket Operators
If you’re deciding between Pocket Operators, here’s how the PO-33 stacks up:
- PO-12 Rhythm – Focused on drum synthesis, not sampling. Great companion, but the PO-33 is more versatile.
- PO-20 Arcade – Geared towards chiptune sounds. Fun but far less flexible than sampling your own material.
- PO-32 Tonic – A drum synthesizer with sound design depth. Again, less versatile than the PO-33 if you want to use external sounds.
In short, the PO-33 K.O! is the most creative and open-ended Pocket Operator thanks to its sampling capability. If you only buy one, this is arguably the best choice.
Who Is It For?
The PO-33 K.O! is a great fit for:
- Beginners who want an affordable entry point into sampling.
- Beatmakers looking for a portable sketchpad for ideas.
- Producers seeking lo-fi textures and unique sound design tools.
- Performers who want quirky, fun gear to spice up live sets.
It’s less suited for people who need high-fidelity audio or advanced editing tools. In those cases, a more professional sampler like the Elektron Digitakt or Akai MPC series might be better. But of course, those cost many times more.
Price and Value
One of the strongest selling points of the PO-33 is its price. At around £89/$99, it’s one of the most affordable hardware samplers ever made. For less than the cost of some software plugins, you get a standalone device that can record, chop, sequence, and perform.
Considering the fun factor, portability, and sheer potential packed into this tiny board, the value for money is off the charts.
Tips for Getting the Most Out of the PO-33
- Embrace the lo-fi sound – Don’t fight the crunchy audio. Use it to your advantage in genres that thrive on character.
- Sample creatively – Everyday noises, YouTube clips, vinyl, or other gear can all become raw material.
- Use pattern chaining – Combine short sequences into full songs.
- Pair with other gear – Sync with other Pocket Operators or drum machines for expanded setups.
- Practice button combos – The more fluent you become, the faster your workflow.
Final Verdict
The Teenage Engineering PO-33 K.O! is one of the most exciting and fun pieces of portable music gear you can buy. It’s not a toy, despite its playful appearance—it’s a powerful sampler and sequencer that encourages creativity through limitation.
Sure, it won’t replace a professional sampler, but that’s not the point. The PO-33 is about immediacy, portability, and joy. Whether you’re a beginner dipping your toes into beat-making or a seasoned producer looking for a fresh sketchpad, the PO-33 delivers in spades.
For under £100/$100, it’s hard to think of any other device that offers so much musical potential in such a small package. If you’re intrigued by sampling, beat-making, or just want to have fun making music anywhere, the PO-33 K.O! is a must-try.