Katherine (and others): there is a very slim possibility that we shipped a few units with no software on them at all! This, of course, would account for No Sound. The most direct solution is to download the latest software from our Github page and flash it to your Macchiato. If you have never done this sort of thing, you may want to find an Arduino-enthusiast friend, who will be able to do this with both eyes tied behind his back. Otherwise, obtain a USB-Tiny programmer and the AVRDUDE utility. Follow the Github instructions.
If you do not want to mess with this, write to us at info at zeppelindesignlabs dot com and we’ll work it out.