[Devel] callback on parameter change?

[Ricardo Wurmus]

>>> is there a callback that hosts use to notify a plugin that lv2:ControlPort
>>> parameters have been modified?
>>> when really needed.
>>
>> Store the old value and compare them.
>
> Also, if you are actually using the ControlPort as a continuous
> control, the old value will be useful if you choose to interpolate
> between values in order to remove any "zipper" effect on certain
> inputs.

Good points. Thank you all.