How to modulate audio fx

I can’t find a way to modulate a parameter (= a knob) in the audio fx.
For example, I would like “LFO” as the modulation source and “mix” in multi-delay as the modulation destination. In the modulation matrix of the synth zone I can’t see those modulation destinations. How can I achieve that?
Any hints are very much appreciated.
Thank you very much.

The short answer is… it’s not possible. Maybe in HALion 7.

As a workaround you could use automation in your host.

To a certain extent it’s possible by scripting. But it’s not very efficient. You would need to script the lfo itself too.

Thank you very much for your answers!