AW: SEM Style knobbies

[Christopher List]

> While I was speaking about such knobs on the SEM that do *different*
> things in both halves (think of FM and PWM), *you* will only need an 
> ordinary
> linear potentiometer.
> Just connect the filter's LP output to the CCW side, the HP output to CW
> side, and the output is at the tap.
> With the knob in middle position, you get the Notch response automatically,
> just like in the SEM.
> If you know these volume pots on
> old car stereos (or cheap stuff like old portable radios, TB303s ...), you 
> got it.
> But take care that you get a *linear* one; most of these pots are 
> logarithmic.
> 
> JH.

Wait a sec, I'm missing something here. Are we talking about a single-ganged 
pot or a dual-ganged? 
If it's dual-ganged, I already knew this answer. 
If not, what's the one wiper connected to? A summing opamp? A follower? I 
either case, won't you still get some of the the other signal feeding through 
when the knob is turned all the way to one side or the other? 

- Thanks,
Chris