Thanks, both of you! I will definitely consider your advice, Vince. If I get a chance, I'll expand this and try to turn it into something worth listening to. I'll let you know if it gets anywhere.
@Enigmus: The alto C (the higher one, recorded twice in the multitrack) is from Focalink, a wonderful maker in Taiwan. It's a 12 hole transverse, and has a range of an octave and a half. The alto G (the low one) is one I made myself. It's pretty lousy. It only has one octave, and requires overblowing to play the G#, due to the lack of subholes. As for vibrato, yes, I can do that, and I have in some of my other videos. Here's one of my best, if you want to see it:
YouTube - Im Wundersch