filter waveform question

[Sean Costello]

Christopher MacDonald wrote:
> 
> Hi,
> 
> I have built a diode ladder filter and have a question about the output
> waveforms I am getting.  I have posted some oscilloscope photos at:
> 
> http://www.evenfall.com/diy/dladder.html
> 
> I am wondering if anyone might know what is causing a "jump" or
> discontinuity near the peak of the waveform when the resonance control
> is turned up.  I have spent hours tinkering with the circuit and can't
> figure out what is wrong.  Sigh.

Does it sound right?  Maybe the "jump" is simply the "ringing" caused by
high resonance.  I know square waves being run through highly resonant
filters exhibit similar behavior.

Sean Costello