I wrote a simple module, give me feedback if you want I improve it.
The module is "sync fading" that you can find on the public online library.
It looks like that:
The aim is to Synchronise the fading fonction of layers as a master parameter.
I would like say "fading function" by the following part on the M8 interface:
I realise you could do the job by midi mapping. See the post how can i activate the 10 layers simultaneous?