pops and clicks around low filter frequencies

[Morphoice]

This seems to be a common problem, I'm using the 4 pole ladder filter. Is there a way to prevent the clicks and pops when the filter closes at low frequencies?

[Lindon]

@Morphoice never noticed this - post a snippet that shows it?

[ustk]

@Morphoice Do you modulate this filter? All filters aren't good candidates for being modulated, I don't remember the whole list from the top of my head though...

[DanH]

@ustk Never modulate the Moog Filter! Although I did find a way round this in scriptnode...

[ustk]

@DanH Yeah the Moog is definitely the worst, but I think the Ladder is bad too

[Morphoice]

@ustk yes of course the filter is modulated with an envelope... mostly the click is at the end of the note when the voice cuts off... how can I fix this?

[ustk]

@Morphoice Try an SVF instead or a Biquad

[Morphoice]

@ustk yeah that seems to be the only solution, no chance getting the ladder filter sound to work.... the moog filter downright explodes my speakers, I wouldnt call those clicks and pops anymore it's more like thunder...
Any chance the ladder filter gets fixed any time soon?

[DanH]

@Morphoice have you tried the ladder in scriptnode? Works fine for me in there... Or put two svf / biquads in series to achieve a similar slope...

With the Moog if you avoid the lowest frequencies you can avoid the thunder....

[Morphoice]

@DanH I'll give it a try. Atm trying to sort compiling issues on the latest mac os

[Morphoice]

@DanH gave it a try, the ladder in script node sounds super nice! I've managed to implement a polyphonic one into my synth however now I need to figure out how to make an envelope in script node and control it with all the modulation (velocity, etc) I had with the standard modules before... sind this is the first time I'm using script nodes I'll have to find some good tutorials.

[DanH]

@Morphoice it should be reasonably straight forward. There's an envelope in scriptnode. Or you can set an envelope and velocity modulator in Global Modulators, then use the GlobalMod node in scriptnode to control the frequency of the filter. Its well worth your time learning scriptnode. Much more flexible.

[Morphoice]

@DanH
Managed to setup a filter with envelope, this works nicely!

However, I need some help finalizing it. How would I go about adding a velocity modifier to change the intensity of the envelope, or how would I change the intensity of the envelope at all? Also I want to have an initial level so the filter frequency doesnt start a 0. How would I add an initial value?
The way I set it up the frequency of the filter is connected to the CV of the envelope. Is there a way to make changes inbetween?
Also is there a way to detach the envelope from the audio itself? or does it always have to affect the gain aswell? to stick with the synth architecture here it should only control the filter frequency, as the amp envelope is a different one in the module tree that can be set seperately

[DanH]

@Morphoice there's a range of tools / nodes for modulation. Have a look at pma nodes, intensity node, min-max, tables.... for velocity try the midi node but remember to put it into a midi container.