I called the Canada Border Services Agency, and they said that one has to apply for a Temporary Admission Permit (Form E29B). Along with this completed form you have to send a guarantee deposit/bond, which you get back once the item is back on U.S. soil. This is the private way, I would think. However, when the shipment is processed by FedEx, they told me to contact FedEx since (and I quote -from French- "they have their way of doing things" (the agent may have been hinting at something here, but refused to elaborate) are the ones who handle this. So the taxes, etc, may stem from the fact that the Canada Border Services Agency (i.e., Canada Customs) considers your audio unit as having been shipped from the U.S. one way into Canada, and decided to levy taxes as it would for any item (because FedEx did not do the paperwork correctly??). (Note that these are sales taxes; duty would apply to devices NOT manufactured in the U.S. and amounts to 8% I believe. The bottom line, I believe, is that FedEx should hold the solution to this. I'm sure you did a lot of legwork here, and I sure would like to know the current status of your audio unit, and, bases on this, what the next step should be. The Canada Border Services Agency's telephone number is 1-800-461-9999 (which may not work from the U.S.) or long distance 204-983-3500 or 506-636-5064
Website: www.cbsa-asfc.gc.ca/contact/general-generaux-eng.html