In my patch above, I am experiencing some high frequency noise (I am hearing what sounds like narrow band ringing somewhere in the 1 to 8 KHz range) that is not wanted and very unpleasant.
Basically, I am using the filtering approach to make a low frequency patch/synth. I am in the early stages of the process, and though I am not new to MAX/MSP, I am a noob when it comes to filtering and subtractive synthesis. So I suspect I maybe doing something fundamentally or amateurishly wrong.
Of other note, if you listen to the sounds produced, the ringing noise seems to be in the same band no matter what I use as the generating signal (tri~, triangle~, square~(a very simple patch I made), or noise~), which leads me to believe its not aliasing, since it doesn't appear to move when I change the frequency or filtering center frequency. I normally initiate the patch as such:
fc: 40 to 80 Hz
df/dt & A: 0
Filter Type: bandpass
Harmonic Cutoff: 1
(also I use unity gain, have tried Q > 1 and sometimes very high to try to get rid of the hi freq, but again that hasn't been working)
Finally, the only 'success' I have had is with masking the sound by using higher value of fc, but that again beats the purpose of the exercise. All help/suggestions appreciated.