I'm really impressed by the ARP 1047

[Haible Juergen]

	>  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 ?

JH.