This is not a fault with the K-Station. The K-Station has an option in the global menu "<
Kill". If this is set to OFF, any notes which are played when the
octave buttons are pressed will not be killed. This is a useful
performance feature which allows a bass note to be held and a solo to
be played from a higher octave on top of this note. This feature can be
disabled if desired by setting <
by switching back to the former octave and re-playing the same notes.
As a saftey when in this mode, all notes may also be turned off by
pressing the PROGRAM button.