— OS history
What’s new
The K.O. II has grown a lot since launch in November 2023 — song mode, resampling, USB audio and the arpeggiator all arrived as free updates. Here is what each OS added, linked to where the guide covers it. This guide follows TE’s guide for OS 2.5 — use the update utility if you are behind (see updating the OS).
OS 2.5.1
Fixes for OS 2.5
- Fixes a crash when cropping long samples and choppy USB audio from some Android phones. In the guide →
+ 3 bug fixes
OS 2.5
USB audio, reverse, sample rates, arpeggiator
- Class-compliant USB audio: stereo in (as a sample source and live input) and out to a computer or phone. In the guide →
- Reverse playback, on the time page of sound edit (
rev). In the guide → - Choose the recording sample rate: 26.25, 32 or 46.875 kHz (codes 500–502). In the guide →
- Mono samples can be up to 40 seconds long. In the guide →
- Equal-length auto-chop (
EQU) alongside attack mode. In the guide → - Arpeggiator: hold TIMING and several pads in KEYS mode. In the guide →
- Key and scale on the knobs while holding KEYS, saved per project, plus blues, harmonic minor and melodic minor scales. In the guide →
- Crop a sample to its trim points with SHIFT + SOUND on the trim page; playback position shown in seconds. In the guide →
- Cleaner time stretching, ported from the EP–1320, and correct BAR sync outside 4/4. In the guide →
- Per-pad pattern copy and paste: hold a pad with SHIFT + C / SHIFT + D. In the guide →
- Erase fader automation for one assignment with ERASE + FADER + a pad. In the guide →
- Timing correct can shift all of a pad’s notes by a tick with − / +. In the guide →
- Hold FX during hands-free resampling to tweak the effect live. In the guide →
- MIDI: CC 64 sustain, CC 12/13 for the effect’s X and Y, identity request over TRS. In the guide →
- Delay, reverb and chorus keep more dry signal; constant-power panning for mono sounds. In the guide →
- Song position pointer now counts from the song start, so DAW playheads line up. In the guide →
- More robust firmware updater; low battery now reboots cleanly with
BAT. In the guide →
+ 30 bug fixes
OS 2.0.5
Stability and sync out
- Improved audio stability and restored the continuous clock on sync out. In the guide →
- Fixes for the EP sample tool, faders, sampling, chopping and MIDI. In the guide →
+ 5 bug fixes
OS 2.0.2
Disk warnings and MIDI reset
- A “disk low” warning when there isn’t room to record 20 seconds. In the guide →
- Optional MIDI “reset all controllers” when the sequencer stops. In the guide →
- Program change is no longer mapped on the device (it is still recorded and passed on). In the guide →
- MAIN plus a single digit switches scenes. In the guide →
- Pad settings survive browsing away and back; new recordings don’t inherit the old pad’s settings. In the guide →
+ 25 bug fixes
OS 2.0.1
Song mode and scene refinements
- Erase scene now deletes an empty scene that isn’t in the song (
DEL) or clears it (CLR). In the guide → - Songs stop at the end and return to where you started; leaving song mode keeps the current scene. In the guide →
- Chop a sample from one group into another. In the guide →
- New MIDI channel setting 127: pads only use MIDI when they have a channel set. In the guide →
- Lower latency on TRS MIDI out. In the guide →
+ 35 bug fixes
- Erase scene now deletes an empty scene that isn’t in the song (
OS 2.0
The “Champions” update: resampling, song mode, sidechain
- Resampling: record the K.O. II’s own output, including whole patterns. In the guide →
- Song mode with up to 99 song positions. In the guide →
- Hands-free sampling with SHIFT + a pad. In the guide →
- Note-triggered sidechain on the output. In the guide →
- Polyphony raised from 12 mono / 6 stereo to 16 mono / 12 stereo voices. In the guide →
- New 1/1, 1/2 and 1/4 note intervals, and latched note repeat. In the guide →
- MIDI thru, system MIDI channels, a new note map, pitch bend and mod wheel on playback. In the guide →
- Hold SHIFT + SOUND for two seconds to save sound edits; swing is saved per project. In the guide →
- Scene changes can wait for the end of the pattern (code 412). In the guide →
OS 1.2.3
Recording fixes
- Fixes double triggers in quantised live recording; the EP sample tool can restore maximum-length sounds. In the guide →
+ 3 bug fixes
OS 1.2.2
Better auto-chop on long samples
- Improved auto-chop on long samples, fixed Android USB MIDI, and soloing with FX + a group key now mutes MIDI notes too. In the guide →
+ 1 bug fix
OS 1.2.0
Project backups and recording options
- Back up and restore projects with the EP sample tool. In the guide →
- Doubling the pattern length copies the existing notes. In the guide →
- Record from the pattern start, and an overwrite recording mode. In the guide →
+ 1 bug fix
OS 1.1.2
Fader overview and reset
- Holding FADER shows which fader functions have been changed; ERASE + FADER resets fader levels for the group and pattern. In the guide →
- Floppy and USB activity icons on the display. In the guide →
+ 2 bug fixes
OS 1.1.1
Filter range and MIDI fixes
- Better range for the group LPF and HPF and for punch-in FX. In the guide →
+ 2 bug fixes
OS 1.1.0
EP sample tool support
- Works with the EP sample tool. In the guide →
- SHIFT + C twice copies all the pads in a group; SHIFT + A finds the next empty pattern. In the guide →
- Hold to set the loop length on the fly. In the guide →
- Hold MAIN at power-up for lock mode. In the guide →
Full details, including every bug fix, are in TE’s what’s new page (OS 2.0 onwards) and the version list on TE’s downloads page .