At home I use a well designed office desk seat. These are very suitable to sit a long time.

In the band I am standing behind the keyboard and use no seat at all.

Fred
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76