>- The amplifier will be no problem for us, we have essentially traded with a collegue for the set up,
Julie, I often catch a lot of flak for raising this question, but is hooking your self up to a stereo amplifier or a computer safe? They are not designed for use on humans and for that reason, they do not have the necessary safety measures built into them.
There are several extensive discussions of this topic on the Zapper Support Forum .