>Or perhaps doing an FFT analysis and seeing what's >really there as a first step to synthesising it. >An oscilloscope with FFT function should be up to >this, or you could get out your A2D and serial >equipped PIC and a PC and .... or dsPic ... ??? -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics