All music from X-Com: Interceptor is available on the CD as Redbook Audio.
Interceptor is the ONLY X-COM game besides E-mail Games: XCOM to include multi-player. Unfortunately, the multiplayer in Interceptor is limited to the flight-combat section only.
In the original game design, you don't need the MacArthur to carry you through the blackhole.
All the alien voices in the game are distorted sounds of science fiction or cartoon sayings, narrated by the developers.