My biggest setup was in the early 80s. I had a high power duo playing a steady thing at an after hours bar (2-5am)
I had my Rhodes in front of me with a Juno 106 racked above. Under the Juno was Moog Source for bass, next to a Korg rack module to layer with the Juno.
To my right was a D6 clav on it's own legs with a Roland Juno D (or something like that)on top. That was organs, the 106 was synths and brass ( well, as brass as it COULD be) - no sequences, no auto anything but a drum pattern from a Yamaha RX120 ..... As a solo or a duo, we were working the same rooms as 5 piece bands in the area, at the same pay scale too. It was a crazy time, but the after hours thing gave me extra money to pay for my new house I worked a restaurant from 9-1, then scooted to the after-hours place till dawn .... 13 weeks of that and I WAS FRIED!
6 separate keyboards, and a drum machine ..... I can do so much more today with just 1 piece, and I get stellar vocal harmonies too! Progress.