Yamaha PSS-390

This is one of the pieces of equipment we know for sure was used but aren't entirely sure where, it's only definite known use was in No.8 (not certain what part) as stated by Owain in this instagram post .

I personally think it's the bass at around 1:38 on the song.

Me and Dudër are fairly certain this was used in a few more songs too, mainly Sodium Chloride for the line part (with some kind of delay effect in front of it.)