Ksp reference Manual

on async_complete callback
Changing FX slot contents is an asynchronous operation. This means, one cannot reliably access
the newly instantiated effect immediately after instantiation. To resolve this, the command returns
an 
$NI_ASYNC_ID
and triggers the 
on async_complete
callback.
Advanced Concepts
201
KSP Reference Manual

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Default Filter Type
Filters are somewhat special as they are effect types that feature subtypes. Since one can now
instantiate a new filter from KSP without explicitly selecting its subtype, there is the need for a pre-
defined default filter subtype. This is the SV LP4.
Implications on Modulation and Automation assignments
When changing the contents of an FX slots through KSP, it is expected that the handling of as-
signed automation and modulation is identical to performing the same action using Kontakt's GUI.
• When changing a slot's effect type or removing it entirely, all modulation and automation as-
signments are also removed. Specifically to modulators, if the removed assignments are the
only ones of a certain one (i.e., if the modulator is not assigned to other targets as well), the
modulator itself is also removed.
• When changing a slot's effect subtype (only applies to filters), everything is left unchanged. It is
accepted that in certain cases, one may end up with "orphaned" modulation assignments as it
is the case right now; e.g., when having modulation assigned to a parameter that is no longer
available, like Resonance or Gain.