The control signal sampling free runs in the background, so it does not have a fixed rate. It will vary between about 50Hz and 500Hz, depending on how big the patch is and whatever else is going on.
This means that control stuff should only be normally used for control applications, mainly knobs, displays and slow changing settings.
Anything that you are going to hear should be done by audio modules as these run at top priority. There are amusing tricks you can do by mixing audio and control, but these have to be viewed as expert trial and error.
