You may call this function to stop execution of an arbitrary event
handler instance. You need to pass the callback ID of the event
handler instance to be stopped as argument to this function.
For the same event type there may be more than one event handler
instances running. Each one of them has its own unique callback ID.
You can get the current event handler instance's callback ID by reading
the built-in variable
|Event handler instance to be stopped.
Since LinuxSampler 2.0.0.svn61.