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Why does my synth distort?


kflak
October 21, 2011 | 7:25 pm

I’m making my first synth, and want to be able to sweep up and down the frequency ranges using a midi controller. However, when I use the button to sweep up and down, I’m getting some very heavy, digital distortion, which is not really the sound I’m looking for. Tried using a line~ object between the controller and the oscillator, but to no avail. Am I missing something really basic that I should have seen in one of the tutorials? Including the patch below.

Attachments:
  1. pitchysines.maxpat

Chris Muir
October 21, 2011 | 8:44 pm

I think that the MIDI controller might be a red herring. If I just let your patch idle for a while it gets really nasty. I can’t tell you why, but I can tell you what. In your "his" sub patch, the right two cycle~ objects are going crazy ofter a while.

It doesn’t seem to happen if I keep the freq control in the signal domain. Save this abstraction as "ScaleSigUni" :

– Pasted Max Patch, click to expand. –

And here’s your "his" sub patch edited to use it:

– Pasted Max Patch, click to expand. –

kflak
October 22, 2011 | 7:03 am

Thanks a lot! WIll experiment with it and see if I can make it work as desired :-) It seems like there is a conflict between the lfo output and the midi controller output that contributes to the distortion as well…

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