SynthMaker

envelope follower

Archive · 2008 3 old posts

From the original SynthMaker forum (2004–2014), with its members’ names and dates.

ouroboros ·

Hello, sorry if I haven't properly sussed this from the user guide, but what kind of signal does/should the envelope follower module output? I am trying to use an envelope follower to modulate a ringmod depth (er, I should say mix level. other wise I could just multiply the ringmod by the follower signal, right?). I am also trying to use e envelope follower module to modulate the "depth" and "feedback" parameters on the chorus module. Right now, it outputs a blue mono stream, but it doesn't seem to create any effect. Do I need to use a multiplier of some sort? I guess I assumed it would output between 1 and 0 or 1-0--1. thanks in advance!

oddson ·

There's a thread where I asked and answered my own questions about the envelope follower: How do you use time values in envelope follower code?

In my second post there I run through what each line of the code does the short version is:

The signal is rectified (it's absolute value is taken) and then a low-pass filter is applied such that the cutoff is different based on whether the signal level is rising or falling.

So the output signal should track the 'volume' of the signal in the range [0,1]. But you need to give it filter parameters so that it does this at the right time scale.

That's what my posts were about... how to calculate the parameters as time values.

ouroboros ·

oddson wrote: There's a thread where I asked and answered my own questions about the envelope follower: How do you use time values in envelope follower code?

In my second post there I run through what each line of the code does the short version is:

The signal is rectified (it's absolute value is taken) and then a low-pass filter is applied such that the cutoff is different based on whether the signal level is rising or falling.

So the output signal should track the 'volume' of the signal in the range [0,1]. But you need to give it filter parameters so that it does this at the right time scale.

That's what my posts were about... how to calculate the parameters as time values.

I seriously owe you a beer, oddson. I am off to digest this now, thanks!

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