She Squeels a little

[BRGPollen]

          Ok, as I am still new to understanding exactly what components do, I'm having a hard time looking for a place to start figuring this one out.  Any help from the collective knowledge here is greatly appreciated.

     First, the pedal in question is the Krankosaurus.  I have built it all up without the 3pdt footswitches and tested it out in my test rig.  The Distortion is awesome, exactly what I was hoping.  The Boost is also cool, clean and loud! So what's the problem right?  My third test was to put the distortion in series with the boost (dist -> boost).  That turned out great as well.  Then I got the crazy idea that it would be cool to be able to reverse the order if I wanted to completely saturate the distortion end.  (I currently do this with a Boss comp in front of all my dirt.  One quick stomp on the comp and the distortion starts to melt down (in a good way)!) SO, I put the boost in front of the distortion and got exactly what I was looking for ............  Then I rolled the volume down on my guitar and the whole thing started squealing like I was roasting a live pig! 

     This doesn't happen with my current setup or even when I put my Fatboost 3 clone infront of my dirt pedals.  I'm perplexed.  If it is not meant to be that's ok.  I still love the pedal with it's intended design.  I'm more after the lesson of why something like this might happen.

Thanks in advance and again,

"B"