Thanks for the reply Noel. Here's a dropbox link. Please let me know if you can download the MGU/SGU file.

https://www.dropbox.com/s/4548pnrh3x79s2x/Test.MGU?dl=0

You can hear what I am talking about at Bar 11 with the B7 chord.

And then at Bar 17 is where I feel the A7 Sus chord is coming in hot and sounds on the verge of clipping. It comes again at Bar 33.

You can hear the warbling effect again at Bar 27 with the B7.

I am wondering if the warbling effect is just a natural byproduct of the recorded 7th chord?

Take a listen and let me know your thoughts. Thanks!