Upmix file into a spatial .wav file

Call order

  1. Initiate Spatial Upmix: start processing the file into a spatial upmix.
  2. Get Spatial Upmix Status: fetch the status of the upmix, and find out when the results are ready.
  3. Get Spatial Upmix Results: fetch the results of the upmix (when the upmix status is done).