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I know that some of the GPO users are involved in musical types that extend beyond the realms of classical so I thought it might be of some use to you to take a look at this Filter plugin "Filterscape" http://www.filterscape.com/ from U-He (maker of Zebra, Zoyd and more feedback machine).

If you are at MusikMesse in april you can chat with Urs (the maker).

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