Hey I tried to get the data logger to work with the gmc-300 model. Not the gmc-300E plus. I got the usb port and the software successfully connects to the port. However, nothing happens. No data. The help file says that you need to connect via audio port. But there is no audio output on the gmc-300. And There has to be a way because I don't know why they would put a data logging feature on the Geiger counter if you cant ever view the data. Any ideas?