The file you want is "fldigi_def.xml" and the port audio items start about line 1998.
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But if this file is in a folder where your user (when you run the program) does not have write permission, I would encourage you to re-install fldigi after reading how to install the user directory in a writeable area - it will save you lots of hassles later on when you want to change more parameters, like disabling the RTTY tx shaping mode (which allows QMX to do rtty properly), make tx macros, etc.? You really want the save config to work.? And it is almost certainly just a Windows file permissions problem.? You will do yourself a favor figuring that out rather than hand-editing the config files.
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Stan KC7XE
