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Extending Moog VA Ladder with Oberheim Variations
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September 20, 2015 - 8:51 pm
Member Since: September 20, 2015
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I'm wondering if I could get some pointers on how to derive the coefficients in Table 7.1 from the information found on pages 26 and 27 of the Oberheim Xpander Service manual. I see something of relationship between the FA, FB, FC, FD bits and the resistor network, but I can't seem to get the values found in Table 7.1 with my math.

Any tips?

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September 21, 2015 - 7:19 pm
Member Since: January 29, 2017
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I did not derive them directly; the table is from Valimaki's source here:

http://www.mitpressjournals.or.....gARf2RVhBc

If I have some free time later I may re-investigate the derivations.

- Will

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September 22, 2015 - 7:31 am
Member Since: September 20, 2015
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Will,

Thanks for the reference to the paper. This will help quite a bit!

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