Ksp reference Manual

17.2. Events and MIDI
$ALL_GROUPS
Addresses all groups in a 
disallow_group()
and 
allow_group() 
function.
$ALL_EVENTS
Addresses all events in functions which deal with an event ID number.
This constant also works with MIDI event commands that require a MIDI event ID.
Bit Mark Constants
Bit mark of an event group, to be used with 
by_marks()
$MARK_1
$MARK_2
…
$MARK_28
%CC[]
Current controller value for the specified controller
$CC_NUM
Controller number of the controller which triggered the callback
%CC_TOUCHED[]
Built-in Variables and Constants
158
KSP Reference Manual

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1 if the specified controller value has changed, 0 otherwise
$EVENT_ID
Unique ID number of the event which triggered the callback
$CURRENT_EVENT
The currently selected MIDI event, i.e. the MIDI event at the position marker
$EVENT_NOTE
Note number of the event which triggered the callback
$EVENT_VELOCITY
Velocity of the note which triggered the callback