i'm new to this web site its great by the way, but not new to vipassana ive sat 6, 10 day courses served on 3, 10 day course and have done many 1, and 3 days course over the period of about 12 years.
in answear to your question, yes the chanting does stay the same but the more you sit the more you end up BEING HAPPY. About 13 years ago lots of thing used to make me unbalances i.e., the dustmen picking up the bins at 530am in the morning outside my house, but the more i meditated the less i heard the dustmen, just like most other things a balance seems to "mostly" stay with me these days and i do owe it to my karma and finding vipassana again.
The more you sit the lest you'll be bothered and might even end up understanding parts of the chanting in pali.
Some of my english friends who have sat the 40/50 day course in india end up understanding the whole chant in pali.
Hope this helps stick with it man.