This does appear to be a multi-machine issue, and perhaps a design one. I hope they fix it for you, but I am pessimistic. I wonder if they would be able to adjust software to higher port speeds? As W1PJE has noted, increasing to its highest port speed makes the click reduce, and much higher in pitch. If they could go from its max port speed to 38400 to 119xxx, or whatever that high port speed is, I wonder if they could reduce that noise entirely? I also wonder if the noise might then interefere with digital performance (or if it does, already)? At this moment, I cannot recommend this rig for digital mode use with rig control. It is a good value for SSB use, and portable SSB, but if you plan to go digital, I would look into other rigs. I am new to digital modes, and leave commenting to others who know more.