Window vibration problem is over. It took way too much time (laziness), but some time ago I had "improved" the problem a bit by simply using packing tape to "stabalize" the small window square that caused the most problems. I had also identified the problematic frequency (140hz) using the "bass traps tracks".
It is only today that I finally got off my butt to play a looped version of the offending track while I poke at the window and used some more tapes. GONE! No more vibration causing cellos to something sound as if played from within a tin can.
Back to music as my neighboors are gone for 4 days!!!
