This was a real pain to build. Came as a kit and I soldered the FV-1 myself. Thought that was the problem as everything else seemed fine. Ended spending a couple of days trouble shooting. Swapped out the CD4069UBE which arrived today and now all working. When I was looking for solutions found out the pots on the front are not the same a the original, should of checked before doing art work. Probably redo it as some point just happy its working.