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> I have two Digital Echoplexes. I was wondering if anyone ever > tried using chips having memory larger than the 4 meg that is >recommended > and what success they had? Would it work with the new Aurisis > software? I haven't tried it, but the FAQ says that 16MB (4 x 4MB) is the max memory. I expect that the circuitry required to decode additional address space was never designed into the device. > Though I am a little late in making upgrades, what is the difference >with > using parity and non parity chips? Is there any advantage to either? The FAQ says that either is fine. The advantage of parity memory is that you can detect some (but not all) memory errors. Even if the EDP has parity error detect circuitry (unlikely) this won't have any real benefit. Errors should be so rare that you would never notice them, or so frequent (bad SIMM) that you'll hear them all the time. > And lastly, what can I expect to get if I use a faster chip (60ns vs >100ns)? Well, that is a 5/3 speed ratio, so the pitch of the notes coming out will be raised by a sixth... Sorry, just kidding :) Faster memory will work exactly the same as the slower memory. The bandwidth of any 30-pin SIMM should be way faster than needed to store and replay audio. The EDP FAQ is at: http://www.loopers-delight.com/tools/echoplex/FAQ1.html Cheers, Rick.