[sdiy] CV mixer help

[pelagius pelagius]

  I've been trying to build a simple 8 channel cv mixer to use as a 
sequencer expander for an 8 step trigger sequencer (made by an unmentionable 
manufacturer ; )
  I currently have 8 pots going into two opamps (I just copied the output 
section of the superseq schemo).  The problem I'm having is that turning 
each pot affects all of the others.  I'm wondering if anyone knows what may 
be causing this.
  Or if anyone knows of a good simple schematic I could use to build an 8 
channel cv mixer, I'd be willing to start over.
  Thanks

P.S.  Also wondering if anyone knows of a good schematic for a vc switch 
that works.  I'm afraid to bother with the one in the Terence Thomas book, 
and I can't find any on the web.  Is that a difficult circuit, or just too 
boring for most people to bother with?
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