Wiardgroup

Hi Pierre,

--- In wiardgroup@yahoogroups.com, "Pierre Zeeman" <pierrezee@...> wrote:


> - the boogie can also operate like a low pass gate, correct?  

yes

>, I am 
> also correct in thinking that the number of poles determines how
quickly the 
> gate will decay? 

the number of poles affects rate of decay , but it affects other
parameters too.
This might help as a foundation:
http://www.buchla.com/historical/b200/index.html
also, it might help to look up message # 1795 on this group


> - how does resonance work in the case of the boogie?  Does it center
on one 
> of the poles or is it across the entire circuit?  

i'm not sure i completely understand the question but i'll give it a
try...
The boogie's resonance centers on the corner (alternately called the
'cutoff' frequency. When this corner freg moves the resonance-center
moves with it. ('poles' refer to the 'steepness' of the slope at which
  frequencies are attenuated) 
In terms of general behavior, the boogie functions very much like a
'classic' analog resonant filter


 i'm at a loss on this query..(sorry)

> Is the resonance behaviour 
> different for each pole?

> - I know it's possible to turn the boogie into a high pass filter by 
> inverting the phase relationship of some of the outs and mixing them
all 
> together. 

and this answer is a 'best guess'

> Is it also possible to make a band pass filter like this?
> 

i doubt it. I think a bandpass filter would require two VC filters of
the boogie's type ...

hope that helps a little,
-doc