I'm giving fldigi a try after using HRD. I'm trying this on the OSX side of my laptop. How do I port audio through so I can listen to my radio. I'm using a KX3 with Signalink USB.
Using Windows, when you connect the SignaLink USB to the computer, configure your Sounds to use the SignaLink for "communications" under the Record and Playback configurations. In FLdigi Click Configure - Soundcard. In the Devices tab, select the USB port for Capture and Playback.