Hi. Please could anyone give me any pointers to try to fix this? My DAW is Logic. I create a multi instrument instance of Halion 7 and create instruments within Halion and send each one to a different Out (main, 2, 3, 4 etc.). I load an instrument into the first slot. it plays fine. When I load a further instruments into halion and play them what appears to happen is that there is white noise introduced into the instrument one. It appears to be coming from the FM OSC section (or at least the sound wave is registering the noise there. I can’t find information about this online, so I wondered if anyone else had this problem and if so, whether you know of a fix? Thank you 
It may not be the FM Osc as it appears to happen when that is switched off. It almost sounds like the type of white noise that occurs when a product isn’t registered or activated (in case that helps identify it), but I believe everything is registered and installed correctly, so I don’t understand why it’s happening. Thanks.