Capturing other audio streams (like Spotify) for use with Roon (Nicecast, Liquidsoap, ...)

[miguelito (Miguel Barrio)]

Spotify or Spotify HiFi in Roon [spotify will not allow this]

My setup:Spotify -> Nicecast -> Roon (running FIR filters) -> Hqplayer (running FIR XO) - DAC

This is VERY interesting. Could you post detailed setup instructions please?