This was mixed in Dolby Surround & released in stereo with Pro Logic encoding. I decoded it into multi-channel & then applied virtual surround for this stereo mix-down. This gives 3D surround with ordinary stereo headphones. Voyage - A BBC Radio 4 Full-Cast Dramatisation by Dirk Maggs After the moon, Mars… What if John F. Kennedy survived the assassination attempt and developed the space programme?