Doepfer

hello to all - 
i got an a-102 vcf recently and just got a chance to really try it out  
yesterday and find myself confused - 
i know one of the vcf`s "properties" is odd freq. / resonance response but  i 
note that  *with no audio input* and any resonance setting over about 20  % 
knob rotation that the vcf oscillates and i can "play" it like a vco from the  
freq. knob.
now, this seem`s a bit extreme as a normal operating mode to me - am i  
missing something important here ?
any idea`s ?
thanks !
best,
dave
 
 


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