I'm not sure if this if the right forum or not, if not, I'm sure someone will redirect me... Here is my question... In the link I have provided below of a Yes reunion, how is Chris Squire getting that big rumbly bass sound on a four string? Take listen at 9:27 onward.
That Electra bass has effects modules so it could be a octave divider (OD) built-in to it, or just an OD in his setup elsewhere.