I still have here in the studio a Lowrey Arranger keyboard I bought in mid 80's. I bought with it a pair of amps that have 5 band EQ's made for lowrey by JVC, (Japanese Victor Company, under Lowrey's name. I still use the amps now and then. They are 35 watts each
The software looked like 4 track tapes (remember those) and plugged into the top of the keyboard. They usually had 5 or 6 styles on them and list price was 75.00 each.
This keyboard cost 2600.00. The amps were about 500.00 for the pair.
I still have them all and they still work.
Amazing but true,
I also had a couple of the Holiday Organs that were amazing for their time, prior to this keyboard, about 1967, I think.
Bebop