True-Bypass / Feedback Loop PROBLEM

[kinski]

So, I built this looper:

http://www.beavisaudio.com/techpages/PedalHacker/LooperWithFeedbackLoop.gif

Everything works just fine, except when the true-bypass loop is engaged, I can still here the feedback loops making lots of noise (but its much quieter than if the feedback loop was properly engaged, but still quite loud). I can only here the bleed of the feedback loop when I am using LOTS of high gain.

Any ideas as to what's happening? 

[alanlan]

Does it change if you toggle the SPDT switch?

[anchovie]

Are you using normal wire or shielded?

(edited to just be a simple question rather than speculating when feeling tired!)