electronics for a diy ribbon controller

[Puentstein]

In a message dated 98-02-27 00:03:05 EST, Puentstein writes:

<<   What kind of old moog do you have? 
  Prodigy, Source and Minimoog. 
 Funny,  after connecting my proto-ribbon thingy to any of these, seems I gain
a nasty-sounding fast audio freq. Lfo mod effect! (WHIRRR!!  - old sci-fi
movie...) 
 Any ideas as to what might cause this?
  (the ribbon works, at least.  Thanx all!)
 The synths all sound just fine, btw, when they are connected to each other,
(cv out to cv in, etc).  
  
  Randy 
  >>