Hi, guys! It's cool you're excited about flute! The G keys of student flutes are generally
offset. This means the G key assembly is on its own, separate rod, about 1 inch long (the keys on either side of your G# key). This configuration allows easier reach for left-hand ring finger, and less tension for most players. Intermediate and professional flutes are now commonly made with this option. In an
in-line assembly, these keys are all mounted on the same rod. This has, for many years, been standard on intermediate and professional flutes in America. Most teachers would recommend an offset configuration for young players. Matter of personal preference and comfort. A
C foot is also standard on beginners' flutes. There are two keys (covering holes) at the end of the footjoint, to play low C# and C. A
B foot (three keys down there) is standard in America, though not in Europe, on most intermediate and pro flutes, but this is also a matter of personal preference. It's relatively innocuous; I mean, if you're not playing Bs in your piece, it's not going to bother you, but will make your flute the tiniest bit heavier. It's nice to have in the event you need to play B, though this usually occurs in advanced solo literature and sometimes advanced (not school band-type) ensemble literature. There is a bit of a psychological (maybe acoustic) advantage to C not being "the lowest note" anymore---with one more half-step to follow, C suddenly sometimes seems much easier. It will also change the intonation of the third octave, usually for the better (slightly flatter, instead of super-sharp). There is usually no extra charge for inline vs. offset, or for having a B key as a standard feature. When buying a separate footjoint, however, the B foot (more silver) will be more expensive. Armstrong is a really-pretty-good flute for a beginner-to-intermediate player. Good scale, nice-enough tone, relatively few trips to the repair shop...
