My Setup using virtual cable software to port audio between HS4 and FLdigi for digital mode use on W10. I was using the 2 sound card approach, but as of 7-19-2019 I'm using this configuration. Just works great!
Here is the link for Help pictures and the 1meg software I'm using at this time-(GMail Shared Folder). If you like the suggestion then drop the software programmer a few $
it is donation ware. My contact info is on QRZ! or here kf5irg at gmail (you know the rest) if you have questions. Or simply post here.

Link: https://drive.google.com/drive/folders/0B6fEnSa51ED3c0V1bXlMZkxXV2c