So I posted about this a while back but can't find the old thread an there have been new developments.

I have the following set up:
Ibanez SR500-Polytune- Boss ODB3 - Boss NS-2 - boss CEB-3 - Morley power wah - ash down mag 300.

Whenever I use the overdrive pedal I get a really loud high pitched "squeal" feedback.
I have tried using the noise suppressor in various positions and isolated the overdrive pedal as the cause of the feedback.

I've tried altering the EQ on bass and amp to no avail. The noise suppressor is new.

Any idea on how to solve this problem?