Here's a patch with some examples using rectification.

Might be smart to use oversampling just around the max~ object http://write.flossmanuals.net/pure-data/antialiasing/

There's also an example here that just biases the mod osc to positive values. The sound has a different character, but it shouldn't alias.

On Sat, Sep 22, 2018 at 7:24 AM, oliver <oliver@klingt.org> wrote:

Carl wrote:

hi Oliver,

i followed a hunch and patched up a version that has a full wave rectifier before the osc1 mod input. this sounds closer to the example. it sounds even nicer with soft clipping of the mod signal before scaling. oh, and this signal gets added to the pitch input of the osc like in your FM example. it doesn't sound perfect and i could be wrong about this method. it feels okay.

hi, carl !

thanks a lot for giving it a try. do you mind posting the patch ?
(I'm not sure i fully understand just by description)

best

oliver

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