Yup, Flip's right. On HMA Warren used a Roland TR-77 drum machine, arguably the first use of a DM on a commercial UK rock album. It was preset-based and designed as an add-on for home organs. Its on/off control was a metal strip so it would sometimes stop or start spontaenously during a set when Warren's leg brushed against it! He combined two of its presets to get the unusual feel on the song.
Both he and Mr Foxx became enamoured of the 77's follow-up, the semi-programmable CR-78 which featured a fair bit on Vienna (Astradyne, Mr. X and Vienna) and on Metamatic. It also saw heavy use by Mr Numan, OMD, New Musik and several other bands. Warren took his to extremes though: he ditched the original wooden case, put it into a see-through perspex one, modded it with separate outputs for the 78's sounds and even tweaked the tuning and decay pots on the circuit board with pliers! That's our Mr. Cann; never happy with just a vanilla machine!