What new features are included in the KO II update?

The OS 2.5 update adds USB audio support, a lo-fi mode with adjustable sample rates, reversed sample playback, an arpeggiator, 40-second mono sample recording, and improved auto-slicing functionality.

Which devices are eligible for this update?

The update is available for EP-133 KO II and EP-40 Riddim samplers. The EP-1320 Medieval model only receives USB audio support.

How does the lo-fi mode benefit KO II users?

The lo-fi mode reduces sample rates to 26 kHz, introducing a distinctive digital texture ideal for vintage-inspired sound design and experimental music.

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Hardware

Teenage Engineering Updates KO II: Lo-Fi Mode, USB Audio & New Features

June 28, 2026

Photo: The Verge

Quick answer

Teenage Engineering has released OS 2.5 for the KO II sampler, adding USB audio support, a lo-fi mode with adjustable sample rates (up to 26 kHz), reversed sample playback, an arpeggiator, and extended mono sample…

Swedish audio technology leader Teenage Engineering has rolled out a major firmware update for its compact EP-133 KO II sampler. Version OS 2.5 introduces a suite of new features designed to enhance workflow for musicians and sound designers.

Key additions include USB audio support, enabling seamless integration with digital audio interfaces and DAW systems. The update also introduces a lo-fi mode with selectable sample rates: 32 kHz for subtle sonic warmth or 26 kHz for a pronounced digital degradation effect. Users can now record mono samples up to 40 seconds—double the previous limit.

The update enhances the sampler with an arpeggiator, reversed sample playback, and improved auto-slicing with evenly divided segments. These tools streamline the creation of complex musical patterns and melodic fragments. Additionally, developers have added new musical scales, refined the time-stretching algorithm, and resolved several bugs.

OS 2.5 is also available for the EP-40 Riddim, a themed variant of the KO II. Meanwhile, the EP-1320 Medieval—a medieval-styled sampler—receives only USB audio support. The reasons for the limited update scope for this model remain undisclosed.

Common questions

What new features are included in the KO II update?: The OS 2.5 update adds USB audio support, a lo-fi mode with adjustable sample rates, reversed sample playback, an arpeggiator, 40-second mono sample recording, and improved auto-slicing functionality.
Which devices are eligible for this update?: The update is available for EP-133 KO II and EP-40 Riddim samplers. The EP-1320 Medieval model only receives USB audio support.
How does the lo-fi mode benefit KO II users?: The lo-fi mode reduces sample rates to 26 kHz, introducing a distinctive digital texture ideal for vintage-inspired sound design and experimental music.

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