Naughty Fish notch filter?

[BassXtreme]

I'm using a 3 pos. rotary switch for LP/BP/HP. Can I use a 4 pos. rotary to add a N (notch filter) position to simulate the Mutron III+? I think I read somewhere you can add a resistor and combine the LP and HP wires to the 4th position that will give the notch effect. Can this be done?

[Lubdar]

Someone correct me if I'm wrong, but it looks like a state variable filter (HP, LP, BP) outputs. I don't think you could achieve a notch response by adding passive components. To my knowledge, you would need to add a summing amplifier stage to bring together the HP LP frequency cutoffs to get a notch response.   Hope this helps...