>|      The modified sine is the output waveform referenced to a pure sine
>|      wave from the power company.  Modified sines are better for
>|      interference or sensitive devices.  Frequency controlled will also run
>|      rotating devices better, closer to rated speed and properties.

        I had thought the modified sine wave was more a dirty (not true) sine
wave and if used with electronics equipment, that equipments timing could
be thrown off or the equipment could be fried (definitely not useful for more
sensitive devices). Take a look at

http://www.traceengineering.com

for info on inverters (though for the applications I've read about, this
probably isn't the place you want to buy from)...

Jade mountain will probably have a bit hidden within that catalog as well...

dave