I have built my third AllStar node using a URIx, but cannot get Tx audio out to work. The node receives audio perflectly, and keys the radio using the PTT line, but there is no audio either from asterisk (e.g. the time announcement) or the "flash" in radio-tune-menu. Adjusting the Tx levels and boost has no effect. I have swapped URIx, cable and radio with a working node, so I have eliminated a bad URIx, cable or radio as a possibility. I have also eliminated a bad node configuration by applying a known good node configuration to the computer (which results in no Tx audio) and using the configuration of this node to a different computer (which works fine). The problem therefore seems to be motherboard related. I have tried two different motherboards: ECS NM70-I Celeron 1037 Mini ITX GIGABYTE GA-C1007UN-D Celeron 1007U Mini ITX Both exhibit the exact same symptom: No Tx audio. The do share the Intel NM70 chipset. Disabling or enabling the on board audio seems to have no effect. lsusb shows only the URIx (C-Media Electronics, Inc) and the Intel USB hub (Intel Corp. Integrated Rate Matching Hub). Is this a problem folks have previously encountered, or have any suggestions what else I can try?