The noise can be very pleasing, sometimes grating if you hit a wrong note.
I bought my second flute on a later trip to a different part of the states. My memory doesn't recall where the shop was but I remember that the doors were wooden and the inside sold musical intruments and LOTS of Native American flutes. I was drawn to this one straightaway and asked if I could try it out. The store owner agreed and I took it to the back and closed my eyes, tuning in to the energy of the flute. I never know how the tune's going to start or what's going to come out. I tuned in to the wood and its energy and played a slow, soft tune. It only lasted a few seconds but I knew this was the flute for me and so we were paired.
It's a very therapeutic instrument and the connection has grown stronger. If I feel a bad episode coming on with regard to the PTSD or anything for that matter, I play it. The flute takes the negative energy away as I breathe out and transforms it into notes that please and soothe me. When I hear it I imagine how the wind touches and talks with all living things; ghosting through trees, over rocks and over the waters and for those moments, the wind takes me with it.
There's a small sound clip of my music with the flute that I've named 'WindWolf' on my profile if you'd like to hear it.