I'm feeling old!
Had an Odyssey and a Wasp, and a Yamaha DX100 as my sound effects machines in theatres in the early eighties, with an alessi (?) fx/reverb. Together with the BBC sound effects records, it was standard set up in rep theatres.
Loved the Arp, wonderfully built, proper keys mine was orange and black with leather side panels, the Wasp was cheap and cheerful and the Yamaha with the tiny keyboard gave me midi and access to the sounds of the bigger DX 7 family Yamahas. Miss them all ... Especially those BBC records ....