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The 64 is a default for a Ctrlr started in normal mode, it needs a value. The problem with that number is that the host asks for that number on load and never asks for it again, so you can’t change the number during the panel lifetime AND the question about the number is sent before the plugins state is loaded by the host so you can’t really respond with the correct value.

Anyway you can set the number to something very high (and i can do that in the source code) BUT that makes the load time of an empty Ctrlr significantly longer (enough to be noticed by a normal user).

This limit is not present when exporting an instance, because in an instance Ctrlr knows how many parameters it should report to the host on start (that’s why the instance is embedded inside).