I'm really impressed by the ARP 1047

[Magnus Danielson]

From: Haible Juergen <Juergen.Haible at nbgm.siemens.de>
Subject: RE: I'm really impressed by the ARP 1047
Date: Thu, 14 Dec 2000 16:16:30 +0100

> 	>  It has a notch output and there's a balance control to tune the
> 	>  notch zero frequency with respect to the filter tuned frequency.
> >   
> I'm a little puzzled about this one. What is it good for ?
> 
> Or is it the same as the variable mix of HP and LP as in the Oberheim SEM ?
> The off-center position (somewhere between HPF and Notch) is highly
> useful IMO, sort of resonant HPF without loosing all the bass.
> But it's nothing I would describe as "tuning the Notch frequency".
> 
> So, is it the same thing on the ARP filter, or something else ?

I interprent this as the feasability of setting your complex zero
poles on a separate frequency than the center frequency. Knowing from
the previous emails in this thread that it is a state-variable filter
this is simple enougth to do. Heck, I could cook it up around the
ASM-1 VCF (which is a state-variable).

It is a usefull thing if you know how to use it.

Cheers,
Magnus