bennyfromtheblock

I'm building a synth and have come across a problem introducing an adsr as a filter envelope. Everything works fine except that whilst holding a note down, if the cutoff is changed nothing happens. I have been trying to solve this for quite a while and not managed to find any solution to what is surely a simple problem. I'm getting the feeling that I'm missing something blindingly obvious.

I have pasted a patch to demonstrate the problem. Any help would be much appreciated.

I'm building a synth and have come across a problem introducing an adsr as a filter envelope. Everything works fine except that whilst holding a note down, if the cutoff is changed nothing happens. I have been trying to solve this for quite a while and not managed to find any solution to what is surely a simple problem. I'm getting the feeling that I'm missing something blindingly obvious. 

filter-envelope-sustain-problem

You are using the output of the adsr~ object to directly control the the cutoff frequency. While you hold a note the adsr~ object will stay in the sustain phase and output a constant value.

Try to make the adsr~ with an amplitude of 1 and multiply the output with the cutoff-frequency parameter. Like this:

P.S.: it should work, but i didn´t test it

You are using the output of the adsr~ object to directly control the the cutoff frequency. While you hold a note the adsr~ object will stay in the sustain phase and output a constant value.
Try to make the adsr~ with an amplitude of 1 and multiply the output with the cutoff-frequency parameter. Like this:

P.S.: it should work, but i didn´t test it


Great stuff, works a treat! Thank you so much David

Filter envelope sustain problem