[sdiy] Sallen Key with input mixing to generate all shapes

[Adam Inglis]

On 22/12/2014, at 10:52 AM, David G Dixon wrote:
>  This trick has some interesting uses.  For
> example, if one audio signal is lowpass filtered, and another is  
> highpass
> filtered, then sweeping the cutoff makes one disappear and the other  
> appear
> at the output.  If a third audio input is bandpass filtered at  
> significant
> Q, then this acts almost like an interpolating scanner, bit with more
> interesting sound.

This sounds very interesting.
Do you have any clips you can share that demonstrate this?

Adam