The first series was therefore the first BBC radio comedy to use stereophonic techniques. Adams later said that before "Hitchhiker's", stereo was deemed impossible for radio comedy and after it was made compulsory. Producer Geoffrey Perkins recalled that the technology available in 1978 for mixing sound effects at the BBC's Paris Theatre radio studio was limited. The production had one eight track tape recorder at their disposal and so many of the effects in the programme were mixed "live" with tape loops of background sound effects strung around the recording studio. Actors whose speech needed to be modified in post-production by radiophonic technicians, such as Stephen Moore's performance as Marvin the Android, were recorded in isolation from the main "humanoid" characters. Moore recorded most of his performance in a cupboard and met the other actors only after the first session was complete.