If you experience pops, clicks or distortion while recording it may be due to incorrect Word Clock sync. Only one device can be the master and all the rest must be slaved. For most applications, the computer will be the master. In this instance, the FIREstation will be set to EXT and mLAN. If the ADAT output of the FIREstation is connected to another device such as a digital mixer, it is recommended that the BNC output be connected to the BNC input of the receiving device (in this case the external digital mixer).