No, not the better-known Arp 2600 — the bootyliciously-large Arp 2500 modular synth. And if you’ve got £ 5,000+ vat / US$ 9,000 / € 7,500 burning a hole in your pocke– er, briefcases — one of these beauties can be yours. Manuals and plenty of modules included. Go buy those lottery tickets now!
For more on the 2500, see Emulator Archive’s extensive page, with history, details, schematics, and manuals. Even more Arp porn, including who played the instrument, at Synth Museum. (Thanks, Tim!)