Wiardgroup

Yes, Constant Q is something to think about. I have one early Omni-
Filter without constant Q and one newer Omni, with Constant Q (and 
Blue LED's). Of course, a constant Q Filter is somehow easier to live 
with, but I don't want to miss my older Omni. In fact the sound of my 
older Omni is slightly different from the newer one and its not only 
the Q-behaviour. Its really hard to describe.

The voltage controlled Filter-Mode is also hard to describe. Its 
morphing not mixing and between the modes is really something going 
on. Dramatic!

--- In wiardgroup@yahoogroups.com, "Gary Chang" <gchang@c...> wrote:
> I have to agree with Olivier - the Omni is quite a useful filter - I
> have a first generation "The Filter" and the last version of "The
> Super Omni" - after several months of use, it became obvious that 
the
> Super was quite a performer, with many features, such as an 
adjustable
> "constant Q' circuit, which was designed to control the issue of the
> filter being more susceptible to oscillatiion at higher frequencies
> was also noticably quieter.  It is the fastest of the Wiard filters
> (the Boogie being the next fastest, followed by the Borg).  The
> bandpass is quite narrow, so Grant has changed the input resistors 
to
> provide a bit of input gain to compensated for lower output of the
> bandpass.  What I like about the Omni is how hifi it is - then you 
can
>  drive the input a bit and get whatever amount of grnnge you want.
> 
> As Oliver described in his note, the MXR-type phasing produced by 
the
> notch is great - the direct input can be summed to the output, and 
the
> ouput of the filter has a phase switch, so there is plenty of 
control
> to make the filter sound good.
> 
> Though Grant has moved on from this design to his voctrol-based
> designs, I would feel that something would be missing without the
> Omni.  It is the Wiard Filter that can make great articulate bass
> patches; while being less "phat" than the Boogie, it's speed makes 
it
> a great filter for many bass applications.
> 
> gary