Midi CC Velocity

Hi! So I connected my OSX Renoise 3,1 to an external DSI OB-6 analog synth via midicable out of my Clarett 2pre soundcard and made a pattern, but the notes all play at the same low volume! The manual says something about using CC#07 for “Global Volume”, but how do I put the CC command into the pattern? And will this not control the GLOBAL volume of the external synth? I want to control the velocity sent to my external synth on a note by note basis, please…

-Joakim