Uwe Berlin...?
Now Jeff Berlin does most (all?) of his work on standard instruments
There are some multitonalqualityplayers out there...
... but in this example is he, Jean Baudin, playing a bass...?
Undoubtedly, this is the work of a virtuoso; a work I truly believe to be an outstanding piece of art, but to me, it is more akin to a keyed instrument, in its percussive fashion... If you watch him playing he is still centred,
bassically, and soloing on the upper register, in a classical fashion; on occasion the lower, register is plumbed, but not that often, and not that noticeably... it is an "ensemble" piece played in a "one-man-band" fashion...
I'll ask again... is he playing a bass...?
Visuals of the style... live playing here of
Transcend on this at 9:13 but also examples of his style from start, 6:04, 7:38