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Pa4X Operating System v2.0

Pa4X Operating System v2.0 introduces new exciting features, improves the existing functions, and streamlines the user interface. In addition, new Sounds and Styles are introduced. This new OS version makes the instrument easier to play, and much more versatile.

New Styles, Sounds, and Drum kits

New Styles, including many in the Pop, Ballad and Dance genres. Most existing Styles have been revised and improved. The new Styles are very modern sounding. The Dance Styles are particularly suited to the new KAOSS FX.

New Sounds and Drum Kits, most based on new sampling sessions, including a very expressive Italian Grand Piano, several majestic Church Organs, very realistic Saxophones, Accordions and Bandoneon, and new Synth Leads and Pads. And you now get one more User Drum Kit bank, with 128 additional locations (for a total of 256).

Style editing is now easier, with an improved test mode and the Mixer/FX editing pages also available inside the Style Record mode. You can now edit a Style without having to jump between the Style Play and Record modes. You also get an overview of the recorded chord variations in the Chord Variation page.


Totally unseen before, the KAOSS FX gives you creative control on your performance. From subtle morphing between Variations and Drum Kit types, fine mixing between accompaniment Sounds, live reshaping of ongoing rhythms, to the most radical note-crunching effects of DJ heritage, to tape delay and arpeggios, you can add 'liquid mixing' to any Style or MIDI Song with the aid of easy-to-use computer-assisted composition features. The KAOSS FX are also available when recording a MIDI or MP3 Song, so that your performance will be preserved.

Break the boundaries of preset music!

Style Creator Bot, Detect Chord function, Chords Sequencer

The MIDI Song to Style Converter is now called The Style Creator Bot and  auto-creates Styles from MIDI and Chord Sequences from a Song's chords.

The Detect Chord function can extract Chord events from midi which can be used in Lyrics or Scores and the Chord Sequencer playback and recording has been much improved.

Keyboard Sets, Updated User and Direct Banks

The Split Point can now be saved with each individual Keyboard Set. User and Direct banks can also be renamed now and the names will conveniently appear in the Selection windows.

MIDI Connection

MIDI connection can now also be done through the USB HOST ports (in addition to the USB DEVICE and the MIDI ports). This allows for easy connection of other controllers with no need of special adapters.

Song Book

The SongBook has been made more intuitive and customizable. Styles or Songs can be replaced from existing SongBook Entries, Songs can be read external Direct SongBooks and will extend the internal database on the fly.


The 2.0 update brings all this and much more such as i.e. bug fixes and general improvements, making the operations smoother.

Get it!

To update, go to korg.com to get the update, read more about it and listen to sound clips.

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