you can read on ketron web site but i copied for you
Update 4.0 b
- Optimized the voice reserve for the Right hand.
- Improved the Harmony function on Folk 1 and Folk 2 modes.
- Corrected the Lyric operation when Midi file is played from Floppy Disk.
- Fixed the holding notes problem when shifting from 1 Touch to Program.
- Optimized the Pitch Bend functioning on Vocalizer