During a Livestream session, my PreSonus Studiolive 32 SX was connected to a Mac computer (USB) with OBS. The sound was fine through the speakers (monitor). The audio mixer level in OBS looked great. However, not all the microphones and musical instruments could be heard on Youtube and Facebook. I don't know how to fix this problem. All the mics and musical instruments connected to the mixer worked fine but the USB connection to the Mac with OBS blocked some of the input from reaching the internet. I tested each connected input separately. the audio level of the mixer and OBS looked good. Please Help.