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PICS do PWM so you don't need to put too much thought into modifying 60Hz mains freq. Secondly, why would you want to modify it? Motor speed control is possible, but may be a lot more complex than it is worth. It takes a good bit of know how to build an VFD that does outputs a clean sinewave and is robust enough to trust.
As for the DIY controller... there are quite a few of us that have taken different routes. There are a lot of good threads here. Some of us use Dallas 1-wire, others Phidgets.com, others home brew ARM based boards, others Atmels or Pics... easttn is a PLC guy... etc.
Bean
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