TB dual looper and bleed noise. Isolated ground problem?

[pedrohead]

Question for you guys.

I had a dual looper pedal built for me (A/B between two sets of loops, I use one for my buffered pedals, and one for a fuzz that doesn't play well with them), and when I'm in the "buffered pedal" loop, I have bad bleedhrough "hum" noise coming from the "bypassed" fuzz loop. If I toggle that fuzz pedal off, it goes away, but also defeats the purpose of the pedal (just hitting one button to swap between the buffered pedal and onto that fuzz). I was poking around and noticed that all the jacks' grounds are wired together, going to the center hub on the 3PDT switch, but also wired to the PS negative jack as well. I checked all the other connections and nothing's loose or grounding out on its own.

Is it potentially the problem that the PS/jacks/LEDs are all sharing a common ground? Would I be better off separating the jacks' grounds and the LED/switch/PS ground?

Thanks.

Here's a pic. You can't really see where the traces are going, but get a general layout understanding.

http://img.photobucket.com/albums/v388/pedrohead/photo3.jpg

[Processaurus]

It is more likely a problem of the fuzz oscillating when it is bypassed, because its input is left floating by the true bypass looper.  Grounding the input of the fuzz when it is bypassed (with the throw of the switch also used for the LED) should stop it from feeding back on itself.

[pedrohead]

It is more likely a problem of the fuzz oscillating when it is bypassed, because its input is left floating by the true bypass looper.  Grounding the input of the fuzz when it is bypassed (with the throw of the switch also used for the LED) should stop it from feeding back on itself.

I think that's exactly what I need to do, I just can't figure out in my head how to accomplish that with the switch (it seems like all the throws are taken up with having to account for the two individual loops send/returns/LEDs and the in/out of the box).

The 9 pegs of the 3PDT are set up in this fashion:

1.Return B           2. LED gnd B        3. Send B
4.Out                  5. Ground            6. In
7.Return A          8. LED gnd A        9. Send A

What would you propose connecting in order to add that functionality? In just poking around with a piece of wire to try different combinations, anything that grounds the A loop while B is playing, also shorts out the signal when A is playing.

Thanks.

[Processaurus]

The simplest thing would be to lose an LED, say lose [LED gnd A] and connect that throw of the switch to [Send A].  Put the Fuzz in the A loop.