One example is sound: whenever you play an instrument, or listen to your stereo, you're listening to sound waves. We can think of these as having the shape of sine waves. For example, if you know anything about playing a piano, the note A above middle C produces a wave shaped like . If you figure out the period of this function (using the ... What I don’t like: the sound is scooped on the mid-range, as most audio interfaces are today unfortunately, giving too much emphasis on bass and trebles. I personally find that classical music does not sound good on the C10, the details get lost. The app design is average. There is no control over the middle in the EQ (on the app).