I guess I wasn't clear enough. Sorry. Let me try again.
Let's say that track A is an Audio track. No automation. Just audio. Track B is also Audio. Track B has an FX plugin.
I would like the level of track A (not the automation - the actual level) to modulate a parameter of the FX plugin on track B. if, for example, the FX plugin is a filter, then i may want Track A *level* to modulate the filter cutoff of the filter that is on Track B.
I need to be able to do the following on a current project - granulate a sound on one track and have its speed vary as a function of the level of another track that is running in parallel.
If the FX plugin has a side-chain feature that specially addresses this, then it may be possible. From what I understand, in Reaper, the DAW handles this level of control and it's not dependent on the plugin.
So - no, I'm not talking about using the automation of one track to copy to another. I need the actual audio level to be the modulator.
I'm looking for workarounds in Logic because as far as I can see it does not have this built in. Am I wrong?
Theoretical workaround: if there was a way to convert the audio level of a track into a Volume automation, then I can copy it to another track and modulate any parameter. That would be less elegant but maybe acceptable. Is there such a function?
Thanks!
Avi