Os X - Renoise As A Midi Slave

hello y’all
i’m a Renoise noob and i’m having a lot of fun with it
tho i’d like to use it as a MIDI slave in Reason to control one of its synth.
and i’ve tried many things in the Configs/Midi Section (and in Reason’s MIDI preference panel) etc… and i can’t make it work :(
i’m quite used to MIDI and i don’t understand why it bugs
so if u know the way to make it work, it would be very kind of you to help me a lil bit ;)
thx a lot anyway,