To get your DAW started quickly, we're in the process of developing templates for each DAW to encode stereo tracks for listening in Ambisonics. These templates are saved on the studio Mac.
If you'd like to set your own encoder and decoder up, or set up your personal laptop, a more comprehensive guide for each DAW can be found here.
Once you've opened Reaper, click on:
File > Project Templates > Ambisonics Listening (Stereo Encoder)
Replace the track in "Audio Source" with a track of your choosing.
Use the Stereo Encoder popup to pan your track around (fig 2.1). If it doesn't appear automatically, navigate to the "FX" button for "Audio Source" on the track control panel (left pane).
Fig 2.1 Stereo Encoder