Hello JonD thanks!
Just thought I would share this, after MUCH MUCH pain and countless hours of total frustration! I have found my problem and would like to share this; hoping that others could
a: simulate the problem
b: avoid it if it does happen.
Believe it or not it was a plugin! The plugin is Soneq. I am saddeed by this, as I LOVE the way it sounds. Does wonders for BD.
I tested thoroughly and under various scenarios so as to duplicate the loud POPS and eliminate other factors.
I would experience a SUPER LOUD POP when I had a loop running. At the end of the loop, regardless of loop duration, I would get a loud pop when the sequence ends and then as it resumes, it would take moments for the audio engine to reinitialize.
I made sure that I installed the plugin in the correct 32bit directory.
I was careful to rule out material-being-played; as I was able to simulate the pop on various busses that had different program material.
I wrote to the company with provided details as to how I was experiencing the POP.
I am ever thankful to JonD and Bristol for guiding me to the ICE9, thank you! Its a lifesaver!
I will keep this panel up to date on whatever comms I receive from the plugin company...