Ksp reference Manual

8.7. delete_event_mark()
delete_event_mark(
,
)
Delete an event mark, i.e. ungroup the specified event from an
event group

The ID number of the event to be ungrouped

Here you can enter one of 28 marks from 
$MARK_1
to
$MARK_28
, which is assigned to the event.
See Also 
set_event_mark()
by_marks()
$EVENT_ID
$ALL_EVENTS
$MARK_1 … $MARK_28
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8.8. event_status()
event_status()
Retrieve the status of a particular note event, or MIDI event in the multi script.
The note can either be active, then this function returns.
$EVENT_STATUS_NOTE_QUEUE
(or 
$EVENT_STATUS_MIDI_QUEUE
in the multi script)
or inactive, then the function returns
$EVENT_STATUS_INACTIVE
Remarks
event_status()
can be used to find out if a note event is still "alive" or not.
Examples 
on init
declare %key_id[128]
end on
on note
if (event_status(%key_id[$EVENT_NOTE])= $EVENT_STATUS_NOTE_QUEUE)
fade_out(%key_id[$EVENT_NOTE],10000,1)
end if
%key_id[$EVENT_NOTE] := $EVENT_ID
end on
Limit the number of active note events to one per MIDI key
See Also 
$EVENT_STATUS_INACTIVE
$EVENT_STATUS_NOTE_QUEUE
$EVENT_STATUS_MIDI_QUEUE
get_event_ids()
8.9. fade_in()
fade_in(
,
)
Perform a fade-in for a specific note event

The ID number of the note event to be faded in

The fade-in time in microseconds
Examples 
on init
declare $note_1_id
declare $note_2_id
Event Commands
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end on
on note
$note_1_id := play_note($EVENT_NOTE+12,$EVENT_VELOCITY,0,-1)
$note_2_id := play_note($EVENT_NOTE+19,$EVENT_VELOCITY,0,-1)
fade_in ($note_1_id,1000000)
fade_in ($note_2_id,5000000)
end on
Fading in the first two harmonics