Analog decay simulation / altering parameter range

#1

Hi y'all,
very first post after having some results in axopatcher , trying to build a complete dubsiren for actual use in our sessions with Vibes Kitchen crew in Ghent ..and in need of some help:

First: I'm looking for a way to add some sort of an analog 'starve ' type decay , I'm guessing I need to use some sort of math function but I have no real clues as how to do it..Any pointers would be appreciated.

In short , my sourcesignal (operator) should be start to degrade/decay/flutter.. from the get go ( dry/wet control ideally, don't know if it should be lin. or exp?) ..;

Second: how would one alter a parameter such as frequency in osc to new custom values?

Thanx and good year patching and creating.
Geoff.Well

ps I have no background coding etc.. just a music enthousiast trying to make something..

#2

So what you whant is a decay envelope? env/d?

I don't if I get what you mean but usually these dub sirens are fed into a dub delay that let's the sound ring out but also get more choruslike and distorted.

So a good Idea would be to patch a dub delay. From my experience it works well to add saturation, filtering into the feedback path and modulate the delay a bit with an lfo to get that tape like feel to it.

#3

Second: how would one alter a parameter such as frequency in osc to new custom values?

You have to connect something to the pitch or frequency inlet (k-rate, blue color) on the left side of the oscillator object.
With an axoloti you can actually make the most sophisiticated dub siren imaginable, but for a simple start you could do something like this: Take an LFO (for example drj/lfo/multi-wave and turn up the amp value), connect its output to the pitch inlet of an oscillator (for example osc/square cheap), put the oscillators output (s-rate, red colour) into the audio input of a vca (gain/vca). Add an envelope (for example env/hd) and connect its k-rate/blue outlet to the blue inlet of the vca. Add something to trigger the envelope (for starters ctrl/button) and connect its boolean/yellow outlet to the trigger inlet of the envelope. And last but not least add (audio/out stereo) and connect the output of the vca to both inputs. From there you can go on adding delay effects and all kinds of other stuff. Good luck!

#4

Hi there,

I have something patched up already and made a small movie to show, however I seem to be unable to embed this, how do I go about this..
And thx for the pointers btw..

Geoff.

#5

Hi! Hope it's going well for you. As I'm trying to make some jungle-ish stuff at the moment I figured some dub siren-like effects wouldn't hurt. So here's my take on it, inspired by a dub siren by "benidub" I found on youtube. It's just a square wave through filters pitch modulated by an envelope and an LFO, delay may be added afterwards.
DubSiren.axp (21.3 KB)

#6

I just added a randomize feature, you can now fade between the entered paramters and complete random ones, so now it's a fun automatic weird sound generator!
DubSirenMKII.axp (59.8 KB)

I needed eight random values at a trigger event for this, so I made a somewhat crude construction where gaussian noise goes through eight s&h objects triggered in a row by a fast square LFO, then, to get a constant value when the sound is triggered, these values are going through another eight s&h objects triggered by the gate signal of the synth. I was able to get eight different values from one noise source this way, but it seemed a bit excessive - I'd like to know if there would have been an easier way, so if anyone has a better idea, please let me know!