Dreams drums loop info

[WarmSir3]

Hi all. I remember watching a documentary where the band and the producers talked about the drums on Dreams in detail; something about them making a loop then having to hold it all together and run it through a tape machine. Does anybody know the clip I'm talking about and could you link me to it? If not how much other info is there on the drums on that track from interviews / articles / books? I find it very interesting, very early drum sampling