Ok I've added the J-K flop flop to the circuit, although I don't think it makes 100% sense to me. A life D type flip-flops has biased me :-). Why connect pins 10 & 12 (set and clr on the same flip flop) together and connect them to reset? I'll have to go and check that does not create an illegal condition? http://www.crundalls.demon.co.uk/mark/bush_internet_tv/ibx101_audio.pdf Regards, Mark Leman