Hello @Moty, welcome!
Have you had a search on the forum for topics about helm? there are various posts that people have made about the topic 
That being said, see if there’s useful information in Using Helm synths in Sonic Pi? - #3 by Eyebot as a starting point
It’s also worth reading up about Sonic Pi’s MIDI functions if you haven’t already: Sonic Pi - Tutorial
I’m sure there would be plenty of folks around that would be able to help you if you still have specific questions after having a read, or helping you troubleshoot a piece of code or equipment setup if you share it here 