Teenage Engineering EP-133 K.O. II Firmware 2.5: What's New?
Teenage Engineering's free EP-133 K.O. II firmware 2.5 adds USB audio, sample reverse, an arpeggiator, 40-second recording, and auto-chop. Here's what's new.
Teenage Engineering released firmware 2.5 for the EP-133 K.O. II in June 2026. It is free, and it adds several of the most-requested features on the sampler. The headline is USB audio, but reverse, an arpeggiator, longer recording, and auto-chop all land at once.
What's new in EP-133 K.O. II firmware 2.5?
The update turns the K.O. II from a standalone sampler into a more connected, more capable instrument. Here are the additions that matter most.
- USB audio in and out. The EP-133 (and the EP-40) now work as a class-compliant USB audio device. You can stream stereo audio straight in from a phone or computer to sample it, and send audio out directly into a DAW. No interface, no awkward cabling workaround.
- Sample reverse. Reverse any sample from Sound Edit mode. A vocal fragment, a cymbal swell, or a breakbeat flips into an instant transition or texture.
- Arpeggiator. After a long wait, an arpeggiator arrives. It works in both one-shot and legato sound modes, so you can arpeggiate chopped samples or sustained sounds.
- 40-second recording. Mono recording time doubles from 20 to 40 seconds. That is real room for longer phrases, field recordings, and spoken-word passages.
- Equal-length auto-chop. A new chopping option slices a sample into even divisions automatically, which is ideal for cutting up a vocal or a breakbeat fast.
Why does USB audio matter most?
USB audio is the change with the widest reach. Sampling used to mean routing a line into the unit or recording from the built-in mic. Now you can grab audio directly from your laptop or phone over USB, clean and full quality. The reverse direction is just as useful: route the K.O. II straight into your DAW and record its output without an extra interface in the chain.
For a pocket-sized sampler, that removes a real friction point. It makes the EP-133 a more natural part of a hybrid setup rather than an island you bounce files to and from.
Is firmware 2.5 worth installing?
Yes, and it costs nothing. This is a free update for existing EP-133 K.O. II owners, so there is no reason to skip it. The new features are additive, and the workflow you already know stays intact.
If you have been on the fence about the K.O. II itself, this update strengthens the case. The same hardware now does more, and Teenage Engineering keeps shipping meaningful feature drops rather than bug-fix-only releases.
How do I get firmware 2.5?
Grab it from Teenage Engineering's official update tool. The firmware is free, and it installs over USB. Connect the EP-133, open the updater, and follow the prompts. Back up any work you care about first, as you would before any firmware install.
