Ian Duclos

I'm trying to make a delay which gets filtered more and more every repetition. I've managed to do this but I'm only able to get a certain amount of voices without the patch getting very big and repetitive. I want to know if there's a simpler way to achieve this effect, if possible with near infinite feedback. I think if I find a way to make it simpler it will help me out a lot in further patches. Thanks in advance. Here's the patch:

anyone-know-better-way-achieve

If I understood well, you are trying to implement some kind of IIR (infinite impulse response) filtering but you are fillowing a finite approach. I am not sure if I am right, but I think you could try to implement a feedback loop taking the output signal and feeding the input again. Probably you want to control the gain of this loop in order to avoid clipping and overdrive.

What I'm trying to achieve if it is possible is to get the delay to be infinite but make the cutoff frequency go down in every repetition.

That is definitely possible. It's the basis of most decent delay patches: input->delay->filter->(saturation is good here)->back into delay.

this is what TITENS and WETTERBERG are talking about.

I know I can plug the delay back into itself, but that wouldn't make the output more filtered than before which was my main intention. If anyone has another idea I would appreaciate it a lot.

actually it should do what you want cause i ran the out of the tapout through the svf~ before feeding back so each loop should be a little different as the new signal is filtered again each time it loops. in fact, i never thought of this and now i am using it in a patch where automated sweeping of a filtergraph takes over 10 minutes to complete as slightly changing audio signals are fed through it and looped so the overall timbre changes over 10 minutes. thanks!

The thing is that you want infinite delay (which is achievable), but also infinite decrease of the cutoff frequency. But frequency is a finite variable here (you can't filter below 0 Hz). So, from the start, no matter the approach you follow, you have to reconsider what you want to do with the frequency

as with all my patches these days... very generic.

the first one sweeps inside the loop. the second after the loop. i'm diggin the first one and will probably use it for myself.

Anyone know a better way to achieve this?