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Virtual Audio Cables
If you intend on using JAERO with a Software Defined Radio / SDR you'll need a way to transfer audio data from your SDR client application into JAERO. This is traditionally done with a communications receiver and a physical connection to your sound card.
These virtual sound cars are pretty simple. Once installed you'll have one or more additional recording and playback devices given to you. The SDR client uses the input cable while JAERO uses the output.
With an SDR application you're going to need a virtual audio cable. There are a few options.
https://www.vb-audio.com/Cable/ Provides a single audio cable for one channel at a time.
VAC Allows for multiple cables, great if you wish to run multiple instances.
If you have PulseAudio installed, then typing pacmd load-module module-null-sink sink_name=Virtual_Sink sink_properties=device.description=Virtual_Sink from the command line will create a virtual cable. Most Linux OSes seem to use PulseAudio these days.