just try it yourself. Take a volume control. Ask it to ramp for 20 samples.
Will you get zipper noise? Depend on the starting & ending level. Does the
host know that? Nope.
If you think that you just need a linear ramping to avoid zipper noise,
without considering the change in level and the length of the ramping (and
ideally, the average freq of the signal), you're wrong.
There is no minimum ramp length, or maximum slope or anything like that, so there is nothing for the host to know.
Zipper noise is what happens when the stairstepping from less-than-audio-rate control data hits the internals of a plugin. It never occurs unless the control data is somehow decimated to an insufficient sample rate before it's applied. With ramp events, hosts have nothing to do with that, simply because the ramp events never say anything about sample rates; they talk about values and durations.
One could compare this to graphics; If a rasterizer can't render edges at certain angles properly, it's not the fault of the structured graphics data, is it? The quality of the rendered image (smoothness of polygon edges, texture sharpness etc) depends *entirely* on the rasterizer.
So, if a plugin produces zipper noise when fed ramp events that do not explicitly generate the zipper noise (ie a chain of events that form an explicit stairstepped curve), the plugin is broken.
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