This might be something folks need from time to time. After much horsing around finally got to work it out especially with 24-bit
Of course ffmpeg need be installed
audacity >> Export >> External Program >>
[16-bit]
ffmpeg -i - -acodec alac "%f"
[24-bit]
ffmpeg -i - -c:a alac -sample_fmt s32p "%f"
[16-bit]
ffmpeg -i - -c:a wavpack "%f"
[24-bit]
ffmpeg -i - -c:a wavpack -sample_fmt s32p "%f"