Neighbor Isolation - Basement Issue

Hi All, I'm dealing with a very sensitive neighbor. I have a wide open basement space that is roughly 30X30 with 6'10" ceiling (concrete to bottom of joices). I am planning a bigger build out, possibly next summer, but in the mean time I want to be loud in the space w/o disturbing my neighbor (or at least cut the noise down). Nothing is really intended to be permanent or pretty, just work for 6-8 months. The home is currently cutting about 35db (test material 105db inside, and 70 outside). I took the old storm windows out (for now) and put a 3/4 board (this is the point the db test was done) and I'm planning to put a 5/8 drywall board behind that. QUESTION 1: what should I use to seal the crack around the board? Question 2: where should I be looking for other "weak" points? The basement concrete wall goes up to the joice, which sits on top of that (see photos). All that is there is plywood, and siding. Thoughts on making this, temporarily, better? Also, the ground is right at where the bottom of the window is (with a 1ft window well for each window). Any thought would be much appreciated!

Also to mention, the wall of the offending neighbor is 30ft, and there are 3 window spots. The pictures show about a 12 ft section, the bathroom connections are a little further down. Let me know if other pics or clarification would be necessary to get this party started. Cheers.

This ain't no party...this ain't no disco...this is your nightmare!!! "The home is currently cutting about 35db (test material 105db inside, and 70 outside)." The existing basement, based on a true an accurate test is isolating or stopping 35 dB. You have already addressed the windows...and they are a major criminal in this area. I would think that with most of the basement underground you would have better isolation than this so I assume your test package may be faulty, I assume with a great degree of certainty OK? Earth is one of the best dampers and isolation is also part of why it is sought after. So we turn again to the windows. Search for how to make a "window plug", you need this information. Also there is opportunity for sound to escape up anyone of those pipe paths, may not bother your neighbor but little mama might not be a big fan of it.

Hey Brien, Looking at the duct work. What would be a good solution for this? Choices: 1. Something like: http://www.ehow.com/video_4971322_sound ... ation.html 2. some other form of duct liner (insulation or rubber?) 3. wrapping the outside with something? Thanks!

A good solution would be to replace the hard duct in the actual recording room overhead with a rigid fiberglass product and to then add a baffle on the air in and the air out side with decoupling on both to minimize the older units noise.