As I continue to learn more about WSPR and enjoy experimenting, I have added a Softrock RXTX (photo attached) and accessories. I am using WSPR 2.12 in IQ mode with CAT 2509 SoftRock. Unfortunately it is a little "buggy" and sometimes crashes when running overnight. I have tried 4.0 beta but it crashes immediately when it tries to transmit (as others have reported). I hope that development continues on WSPR. I am very grateful to Joe K1JT and the others for this fascinating mode of communications. This is the most fun I have had in my 60 years as an amateur radio operator.