I'm glad you included "the sound"--the one on the intercom after the first landing. I'm betting everyone who has soloed has made that sound in one form or another. When I made that sound, it was louder, more high-pitched, and just as relieved.
First solo is an amazing feeling of accomplishment, and a gateway to an entirely new perspective on the world. There is something truly magical about the idea that you are now capable of climbing in an airplane all by yourself and taking it wherever you want to go. It changes how you think of yourself, and how you look at the world as a result. It's like having your own magic carpet.
Congrats, and welcome to the magic carpet club.
