Hi,
here is a link for you :
http://alain.fraysse.free.fr/i30/i30main.htm and this one too:
http://www2.iicm.edu/gnistyle.zip this one for a download of an editor in shareware , some explanations here
<< Shareware GNIStyle for KORG i-series Keyboards
Create your personal styles for your KORG i-series Keyboard or module on PC (Win95, Win98, WinNT4, DOS).
Shareware program helps to convert small loopable MIDI files (patterns) for each variation button (Intro1-2, Var1-4, Fill1-2, Ending1-2)
into KORG i-3 style files. Most i-series can read them directly from floppy disk, some need conversion with a style converter on this page (is40, is50), i30 users should have installed OS 2.0 (
http://www.korg.net/) or higher that i3 files can be loaded directly into i30.
This program can also be used to modify existing KORG i3 styles. Editors for style title, style program&mix, chord variation table are included.
Supports direct testing of MIDI tracks on keyboard with MIDI cable. Contextsensitive help with tips how to create styles (from own ideas or from a midi song).
The free demo program from this page can be used to create simple styles with your MIDI sequencer. It is all you need to test if it works, full version is identical file without limitation of variants.
The registered full version supports creation or modification of 4 KORG i3 user styles per style file, with up to 36 variation tracks for 10 keyboard buttons and 6 instruments (Drum, Percussion, Bass, Acc1, Acc2, Acc3) per style. >>
Hope this helps!