I've done the same thing with the sync. the only difference is that I have hot glued the bluetooth adaptor on the right side of the head band. I have a small 3.

I've done the same thing with the sync. the only difference is that I have hot glued the bluetooth adaptor on the right side of the head band. I have a small 3.5mm cable that links the adaptor to the headphones. Proper ear monitors are the holy grail, as they are comfortable (if you have your ear cast/pour done properly) and should have >28 db of noise reduction. Alas I don't have a proper cast anymore, its about £200 to get it done properly. The problem with noise cancelling headphones is they are great for white noise/whirs/traffic, they are terrible at blocking voices. However I don't have music playing in the office. I just use the ear defenders as attenuators. Its only on the commute do I listen to stuff. The sync only knocks off 25db, you can get ear plugs/defenders that reduce noise by 34db. Some of the howard leight squidgy earplugs are super comfortable, soft enough to sleep in.