Flex-6000 series is a great contest radio. However, when running contests from a remote location present SDR software cannot produce local CW sidetone unless you use the built in CWX keyer and NOT use a logger program to automate it all. Same with Flex Maestro who does produce local sidetone but you cannot integrate with a local PC contest program (easily). Flex will eventually come up with a solution soon but till then we need a solution. The solution is the Remote Rig concept. Easy and not expensive (you may find these at the local swap market).
You may use Remote Rig boxes to produce local CW sidetone very easily. Here screen shots from the confuguration pages of the RRC boxes. I use COM Port 3 (COM Port 1 may also be used with a USB cable). Just find the corresponding Windows COM port (in the device manager) and use that for CW keying in the logger program. That´s all to it. 🙂