Quisk has had builtin support for FreeDV for many years. The new RADE mode is exciting, especially the 1 dB peak to average power. So I am very willing to add the new FreeDV RADE to Quisk.? Unfortunately it is early days and there is no documented API for RADE. I don't want to pester the developers with support questions when they are working to finish the design and convert the Python code to C.
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In the meantime the solution is to use their published FreeDV GUI application for RADE. This will work with Quisk by connecting it to the digital inputs and outputs just as you would with WSJT-X.
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Jim
N2ADR