Hi,
I've been toying around with pd recently and I decided to build a simple monosynth to start. I control it with an 8-knob midi keyboard where the knobs change things like osc pitch, adsr values, and filter cutoff and resonance.

I realize that the adsr patch is a little awkward--I'll clean that up soon. But I think I fried my brain on taxes and I can't figure out how to make a good resonant lowpass filter. I stacked 8 of the lop~ objects and I think it output an 8-pole filter without resonance.

Does anyone have any ideas how to make filters with resonance? I tried the vcf~ object, but it was screwy and band-pass.

Secondly, (again, taxes hurt my head), I can't think of any clean examples of lfo's that send control messages (the thin lines). I messed around with an env~ object and an osc~, but it was goofy and didn't work effectively. Any help or patches would be a help.

Thanks.

http://www.pdpatchrepo.info/hurleur/mono_midi_synth.pd

For the lfo try bang~ (bang at end of every dsp cycle) going into a snapshot~

As for the filters i'm not sure what to suggest if you've had a look through everything in pd-extended, maybe a feedback stage (*~ 0.01 LOL)?

good luck - sounds like a fun project!

You can make a LFO for the message rate using a counter and [sin] or [cos] (see attcahed)
Nice thing this way is you can sync all your lfos to a common metro clock.
Attached example for one that is always positive (correct for filter control etc)

Synth is looking good so far. I like the super LPF (probably overkill

http://www.pdpatchrepo.info/hurleur/klfosin.pd

Both of the suggestions above work great! Thanks for the thoughts.