# PO-33 vs EP-133 K.O. II: Which Sampler Should You Buy?

> Compare Teenage Engineering PO-33 and EP-133 K.O. II for pocket sampling, performance, memory, and building fuller arrangements.

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Category: Tech

Choose the **PO-33 K.O!** if you want an inexpensive-to-carry, pocket-sized way to capture sounds and make short patterns. Choose **EP-133 K.O. II** if you want more sampling capacity and a larger performance surface. The smaller instrument is useful because of its limits; the larger one is useful when those limits obstruct your ideas.

The [PO-33 in our collection](/products/teenage-engineering-po-33/) is the Pocket Operator. EP-133 is the larger K.O. II, not another name for the same model.

## What changes when you move up?

| Decision | PO-33 K.O! | EP-133 K.O. II |
| --- | --- | --- |
| Physical role | Pocket sampler | Larger sampler and composer |
| Sampling capacity | 40 seconds of sample memory | 128 MB sample memory |
| Recording sources | Built-in microphone and line input | Built-in microphone and line input |
| Main buying reason | Small, immediate sound experiments | More room for samples and arrangements |
| Learning question | Can you work within a tiny instrument? | Will you use the broader workflow? |

The [Pocket Operator documentation](https://teenage.engineering/products/po/metal) and [EP-133 guide](https://teenage.engineering/guides/ep-133) establish the capacities and inputs. Seconds and megabytes are different measures: do not interpret their numerical ratio as a meaningful capacity multiplier.

## For a first sampling experiment, small can be enough

If the goal is to record a household sound, turn it into a rhythm, and see whether you enjoy sampling, PO-33 has a clear role. You do not need a large library to discover how changing pitch, trimming a sound, or repeating it changes an idea.

Its limited memory makes selection part of the process. Plan a short set of drum sounds and a melodic sample rather than assuming you can load a complete sample collection. If deciding what to leave out sounds enjoyable, that constraint may help. If it sounds frustrating before you begin, consider the larger instrument.

Also think about how you will carry it. Pocket size does not mean a bare circuit-board instrument is protected from keys, pressure, or accidental impacts. Include a suitable case if it will travel every day.

## K.O. II makes sense when the arrangement grows

The manufacturer positions [EP-133 as an evolution of PO-33](https://teenage.engineering/products/ep-133). More room and a larger interface can make it easier to keep a collection of sounds available while developing a performance.

Before upgrading, name the moment when your Pocket Operator becomes limiting. Do you run out of sample space? Want a different arrangement method? Need a larger control surface? Those are useful reasons. A larger chassis alone does not guarantee a better finished track.

For either instrument, check the guide's backup and transfer procedures before making irreplaceable recordings. A sampling tool is more useful when you know how to keep its contents and recover your work.

## Compare the whole workflow, not just the price

A first sampler also needs a listening setup. Decide whether you will use headphones, a speaker, or a recorder, and check the cables for the sources you intend to sample. If you plan to make complete releases, think about how the result gets to your computer.

Neither a compact sampler nor an expanded one is automatically a substitute for a general-purpose music workstation. For a more extensive instrument comparison, read [OP-1 Field vs OP-XY](/journal/op-1-field-vs-op-xy/). That article focuses on recording and arranging rather than simply collecting sounds.

## Frequently asked questions

### Is K.O. II the same as PO-33?

No. K.O. II is the EP-133, a separate, larger product inspired by PO-33.

### Does PO-33's 40 seconds mean 40 seconds per sound?

No. Treat it as the device's sample-memory budget, not an allowance for every sample slot.

### Should a beginner start with K.O. II?

Yes, if the expanded workflow is the one they want to learn and the size and current price fit. PO-33 is a sensible alternative for a deliberately small experiment, not a compulsory first step.

## Objects in this story

- [Teenage Engineering PO-33 K.O!](https://wishlist.supply/products/teenage-engineering-po-33/)