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Bingo! There are manufacturing differences between the beige and black units (aside from software version). This page http://www.loopers-delight.com/tools/echoplex/LoopIII_v5.html writes: Power supply variations on some units could cause slightly low readings for Feedback, causing problems where the loop would decay even with the know all the way up. Units had to be tested for this problem in production and fixed before they could ship, which was inefficient. Some units undoubtedly shipped with such a problem, and there is the possibility of developing it as the hardware ages. Changes have been made in software to tolerate worst case voltage variations across all the relevant circuits. This corrects the problem, with the tradeoff being a slight reduction in feedback resolution at the top end of the scale. It doesn't appear to be noticeable, and is definitely worth it for the improvement in reliability. More notes here: http://www.loopers-delight.com/tools/echoplex/FAQ6.html#Anchor-47383 http://www.loopers-delight.com/tools/echoplex/FAQ6.html#Anchor-17304 At 2007.12.13 07:32 AM, Travis Hartnett wrote: >My two main EDP's are one of the old Oberheims and a recent blackface >Gibson. I also had my Oberheim sent to British Audio to get the LCD >replaced (burnt out element from the factory) and they updated a few >things at the time--cooler power supply, something on the Mix control, >and one or two other things that I can't recall. > >The thing to look out for when purchasing a beige unit used is the >software version, as it's about $125 to get the new version.