[Devel] callback on parameter change?

[Paul Giblock]

>> 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.

Paul