I am trying to help someone attach a node to a CAT controller and this is the first time EVER that I am not using DSP. Seems like we are having issues with COR and also RX audio. Since I have never used these inputs, we need some help. Here is a sample entry in the URD file and was hoping that someone might be able to supply a few tips. I am not using CTCSS so I said "no" and am using a logic high when no RX signal present, the CAT controller drags down to 0 volts upon signal detection on the repeater receiver. I am not getting any action when this happens though. I even tried to use "USBINVERT" but that had no effect. I see about 3 volts when idle. Any thoughts? Note I even tried to use VOX and that did not work for some reason. hdwtype=0 ; 0=std,1=dev eeprom=0 ; unless you have a cable w/eeprom duplex=1 ; 0=simplex, 1=duplex invertptt=0 ;minsigproc=0 ; minimal signal processing ;sendvoter=0 ; 0=default, no voter rssi, 1=enable voter rssi carrierfrom=usb ; no,usb,usbinvert,dsp,vox ctcssfrom=no ; no,usb,dsp rxboost=0 ; rx input boost of 20dB rxdemod=speaker ; no,speaker,flat txprelim=0 ; 1 = pre-emphasize and limit Thanks! Lu Vencl, KA4EPS