Ksp reference Manual

8.12. get_event_par()
get_event_par(,
ter>)
Return the value of a specific event parameter
of the specified event

The ID number of the event
Event Commands
61
KSP Reference Manual

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The event parameter, either one of four freely assignable event parame-
ters:
$EVENT_PAR_0
$EVENT_PAR_1
$EVENT_PAR_2
$EVENT_PAR_3
or the "built-in" parameters of a note event:
$EVENT_PAR_VOLUME
$EVENT_PAR_PAN
$EVENT_PAR_TUNE
$EVENT_PAR_NOTE
$EVENT_PAR_VELOCITY
$EVENT_PAR_SOURCE
$EVENT_PAR_PLAY_POS
$EVENT_PAR_ZONE_ID 
(use with caution, see below)
Remarks
A note event always carries certain information like the note number, the played velocity, but also
Volume, Pan and Tune. With 
set_event_par()
, you can set either these parameters or use the
freely assignable parameters like $EVENT_PAR_0. This is especially useful when chaining scripts,
i.e. set an event parameter for an event in slot 1, then retrieve this information in slot 2 by using
get_event_par().
Examples
(see next page)
on note 
message(get_event_par($EVENT_ID,$EVENT_PAR_NOTE))
end on
The same functionality as message($EVENT_NOTE)
on note
message(get_event_par($EVENT_ID,$EVENT_PAR_SOURCE))
end on
Check if the event comes from outside (-1) or if it was created in one of the five script slots (0-4)
on note
wait(1)
message(get_event_par($EVENT_ID,$EVENT_PAR_ZONE_ID))
end on
Note that in the above example, an event itself does not carry a zone ID (only a voice has zone
IDs), therefore you need to insert 
wait(1)
 in order to retrieve the zone ID.