u/Cheesecake4Laif

Just building my Blissbound Warband and I'm on the Noise Marines. I was curious how Blastmaster works (I will be taking 2) but I'm confused as to how the frequency works? I somehow haven't found anything online or maybe I don't know how to search properly, but are single and varied frequency different weapons, or different modes of the same weapon that I call whenever I shoot?

EDIT: not 4 minutes later I have my answer, thank you guys :)