1984: Yamaha PS6100. The sounds were not very impressive, not even for the time, but the design was fantastic. It had the same flip control panel as the Technics KN7000 reintroduced 20 years later. Sold it many years ago.

Technics KN700. Five piece was having trouble finding work. The Technics permitted scaling down to a more affordable (and Hire-able) duo.
The redundant styles drove me crazy and later I added a Roland E20 for variety.
Eddie

A casio. Can't remember the type.

TommyF

I had one also, and people said it sounded pretty good. Of course, that was 40 years ago with FM sound before we all became spoiled.

yamaha 630 then korg i5s . got tired of playing bass pedals. the arranger was just as effective. less work for me. still use the korg and a psr 1000. retired now

An arranger module, a Solton Artist 2000, with matching Solton a-2000 accordion. Keyboard- Yamaha e223 or something close to that.

Roland E38. Decent enough, but hated the bass sounds on it.

An Optigan I bought about 1975 from Monkey Wards. Had about 3 dozen disks. I didn't keep it long. But I got one for free last year, but only has one disk.

Duane

A Solton MS-40 arranger module connected to a midi enabled Elkavox accordion.

Hi
my first decent arranger was the technics kn800 back in roughly 1988. I did have a funny little Yamaha a couple of years or so earlier, but it was more of a toy.