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The fx loop works, but the volume increase just to distortion.
When nothing is connected to the fx loop (only a jumper wire between send and return) all is normal, but when you plug any effect the delay is like a noise machine. And there is another problem. The fx loop only start in the second repeat, first repeat has no effect.
Thanks!
 

I found the problem: led popping. Without led works perfect.

Sorry...thats not the problem 

Is every time I press the bypass footswitch (on/off). In both modes (tails and true bypass) I hear the noise and the noise repeated. Is not loud but with repeats is annoying.

Thanks!

Hi!

Verified, it works fine! There is only a problem. When turn the effect on there is a pop noise that go into the audio circuit and sounds pop-pop-pop-pop with repeats. But only when the effect is turned on. I have a pull down resistor but the noise continues there.

Everything else works fine. Now I can switch between both modes without any problem.

Thanks!!

Wow!!
Thanks for the time!! I try it and I reply if is verified.

fixed,  I trust...
plus a smaller one with standup resistors/diode

Sorry but I think the vero is still wrong. The drain goes to point A, now you have gate to point A. Turn the transistor 180º.

I don't know how to make a mod to have trails when bypassed and switch when I want to true bypass.
But anyway thanks for the reply!

But I have a question: this can be done in a true bypass pedal? And is it possible to change between bypass (with trails mod) and true bypass in the same pedal?
Thanks!

All this does is block signal by shunting the connection from the dry path at the input of the delay line -- it can't "bypass" anything. If you want something similar, check out the millennium bypass.

Sorry...I thought it was the trail mod, like other delays (Diamond memory lane 2, Visual Sound tap delay...), where the repeats continue when the effect is turned off. In this delays, there are a switch to change between trails mode (the repeats continue when the effect is turned off) but buffered bypass, and true bypass mode (the repeats stop when the effect is turned off). That was my question but my english is not good!

Thanks!

Hi!
(in the vero I think the transistor is wrong placed).

Hi

Can you explain why? It looks right to me...

Ian

In the schematic the "source" leg of the transistor is connected to C2, but in the vero C2 is connected to the "gate" leg.

Hi!
Thanks for the schematic and the vero (in the vero I think the transistor is wrong placed).
But I have a question: this can be done in a true bypass pedal? And is it possible to change between bypass (with trails mod) and true bypass in the same pedal?
Thanks!