Ok, I have it working now. The manual of the EFX MKIV Is quite bad TBH.

At first I didn't know how to set the CC channels above 14 to on and off per preset. I had to set the IA max page to a higher number (3 or 4) to be able to access them. I can now use them to Activate the H9 per preset. 

Secondly it wasn't totally clear that the loops themselves also send out CC values. So for FS1 I had to set CC channel #11 to send out CC number 20 for instance for tap tempo. I can now indeed control tap tempo with FS1. 

Only thing I haven't figured out yet is how to get out of Instant Access mode easily with the foot without storing changes. 

Also can I get to the FS1 for tap tempo without going in Instant Access mode? 

Thanks!