"find out more here" excerpt: "This multipulse squarewave synth keyboard from 1989 has wonderful C64 homecomputer sounds, including some of the famous arpeggiator timbres those are missing on most other squarewave keyboards. Although this is not a SID Station and has no filter, it is one of the most versatile and interesting sounding squarewave instruments and (like MC-3) basically a 'must have' for a real squarewave lover."
YouTube via cmatsuoka "... (or something closely resembling it) is using a delay effect. I noticed that most X-Files theme tutorials out there either skip the signature echoing entirely, making the tune much less recognizable, or play it by hand, adding complexity to the performance. This short howto illustrates how easy it is to play the piece using the appropriate effect."
YouTube via pac209 "Available in 2009: a good 808 clone and a good 303 clone, both with shuffle and good sequencers. Makes me wonder why it took this long to happen...."