Prevent multiple callings within the same update call

[chkworks]

Copied over from the chat, when asking why the LFO is called multiple times from the layer region.

Answer from @natan-sinigaglia:
"keep in mind that the layer gets called every time it gets sampled. the UI is sampling it to get a value for drawing!!!! so the LFO gets called many times.
there could be a mechanism to prevent multiple callings within the same update call of the patch surrounding the region. it could be implemented in the region. add it as a wish in the issues section"