Determining price based on sales seems to be a bit twuntish. If you're going to increase your price then you may as well say you'll be adding additional features instead of insinuating that if sales are good or bad (it's assumed that you will raise the price if they're good) then you may raise your price. I don't like this sort of behavior and frankly if you raise your price if the app sells well without giving additional features then rest assured the public will speak out against that.
Jessica, thanks for your reply. You're right, I should have explained this better. Actually, my thinking was the other way around: if sales go well I might as well leave the price at $0.99 but if I only sell a handful of copies a day even at $0.99, I'd rather (a) increase the price to $2.99 or so in the hope that the handful of people will still buy, or (b) make the app free, realizing that's a tough call too because I might offend my early customers.
Since this is my first app, I have no idea how the response from customers will be and I'm very excited to find out. With my statement above, I wanted to say that this is all a big experiment for me (as it is for many independent developers on the App Store). I did not want to call the $0.99 an "introductory price" because I haven't got a firm schedule if and when I was going to increase it (and by how much). It might very possibly stay at $0.99 forever.
And yes, more features are planned, regardless of the price I am going to settle on eventually. But you are correct: I should avoid a price increase without adding new features, and I promise you I will. Sorry for the wrong impression.
I'm not going to revise my post above (if only to document the discussion) but I'm definitely going to think about this (and my sales verbiage).
Can you view any previously viewed lyrics offline?
Yes, Songtext caches previously downloaded lyrics. By default, it will try to update cached lyrics if a week (or a day, or a month; this is configurable) has passed since the last update but even if you're not connected to a network at that time, you will still have the "old" lyrics.