Assign the Speed of the Strobe effect to a Fader?

The common way to achieve this to have an effect running and assign the fx rate to the fader:

Instead of using the device‘s strobe you create your own strobe by using an absolute effect. Cycle time should be less then a second. Depends on the strobe you want to see, but think about grouping as well . 

record that into submaster and set the fader to fx rate. This way you can bump the strobe and speed it up or slow it down with the fader. 

Thanks! I was using the inbuilt effect on the Console, and after you wrote this i found the tutorial related to my problem in the etc video library! Thank you!

Having a EOS-FX running for a strob can work.
I would rather go directly for the internal Strobe-Rate.

Mostly the Strobe is set up in Patch as "snap".
If you undo this you can put the Strob-parameter on a Fader and adjust it to your liking.

----

Why do i like the internal Strob more?
DMX has its own speed. So there could be a a time when the DMX is to slow.
So better go with the internal strob, that is calculated in the Fixture, then try to make it strob from external.