Hi, well I wouldn't mind having some of the features in the Harrington 1200 ! http://www.youtube.com/watch?v=v5cWWV0KNDg&feature=PlayList&p=CBF54943AAB970FC&playnext_from=PL&playnext=1&index=2 I think that there are already a lot of very nice vco designs about, so i wouldn't want to try to reinvent the wheel ...... regards Peter