via this auction
"For those unaware, this grey panel is the superior Arp2600 to the orange panel version that has the original (quasi legal) filter. Moog sued Arp in the mid 70s [not true] and won the lawsuit for Arp stealing their filter design. The later orange panel arps have an inferior filter which takes away a lot of the character that makes a 2600 sound like a 2600. If you open up the inside of it you will see the filter is covered by black plastic cover, this serves no purpose other than for Arp to hide the design theft."
It's my understanding there was no law suite and rather Moog approached ARP who then changed the design. If anyone wants to chime in feel free to in the comments or shoot me an email.
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