When reading the manual this is what the bottom part says about what is needed:
When i look at the Ableton description, in there you have to insert Razor as an effect which is already giving a clue as of what it uses for modulation or how it generates its modulation signal.
I’m not sure if Razor is listed as an effect in Renoise, but if it is, then try adding it as an effect to the track where you want to seed your modulation signal.
Processing the carrier is a bit more difficult to pinpoint where it exaclty needs the midi from, but i can give you directions what you can try:
Select the Razor VST instrument plugin in one of the instruments in the instrument list.
Pick another empty instrument slot and now go to the alias section on top of the whole VST instrument plugin list and select the Razor FX Alias plugin (not the VST instrument alias!).
Read the following section of the Renoise manual:
http://tutorials.ren…ugin_effects.29
Here is a topic that is giving some more tips on how to use vocoders in Renoise. Various plugins use various methods so there is no one-way to do it for all plugins…
http://forum.renoise…70-vocoder-vsts
I hope this helps.