[sdiy] Oberheim Xpander Multimode VCF Question

[Jay Schwichtenberg]

Steven,

Some where out on the net there is a lot of info on the filter. Schematics
and the modes that it supports.

The Doepfer site has a clone with the db info.
http://www.doepfer.de/home_e.htm

Jay S.

> -----Original Message-----
> From: synth-diy-bounces at dropmix.xs4all.nl
> [mailto:synth-diy-bounces at dropmix.xs4all.nl]On Behalf Of Steven Cook
> Sent: Thursday, March 11, 2010 2:20 AM
> To: synth-diy at dropmix.xs4all.nl
> Subject: [sdiy] Oberheim Xpander Multimode VCF Question
>
>
> Hi,
>
> Is it possible to get a -24dB/oct allpass response out of an Oberheim
> Xpander type of 4-pole filter arrangement? I've got the following for
> an -18dB allpass, from a post by David G. Dixon...
>
> input + pole1*3 - pole2*6 + pole3*4
>
> Which seems to work fine (in software).
>
> Regards,
>
> Steven Cook.
>
> http://www.spcplugins.com/
> +44(0)1271 867288
>
>
> _______________________________________________
> Synth-diy mailing list
> Synth-diy at dropmix.xs4all.nl
> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>