Design 2 stages x Dealy - need help

[electricco]

Hi, In order to build a delay based on PT2399 I built this "simple" 2 stages circuit.
It works, ok .
The strange thing is that when the sound is over (normal decay of the notes) I can hear a "soft noise" like an "electrical breathe".
After few seconds it disappeared like it is a tail of the notes decay too...

I'm using IC 4558, it was tested also with TL072 with little improvement but still breathe persisting.

So I'm wondering what there is of wrong in this design ?



Thanks

[electricco]

[bluebunny]

You're trying to post an image that lives on your PC!  Sadly, we don't have access to your C: drive.     Upload it to somewhere like imgur and post a link.

BTW, the PT2399 isn't a hi-fi part.  Expect noise.