After getting fed up with having to use 4 buttons to operate the TV, SKy, TiVo and the home cinema kit I eventually succumbed to buying a Harmony 688 as I thought it would do the job. However, I cannot get it to do 1 key part which is frustrating the heck out of me. Before I had the Harmony remote, once I switched everything on, I would press the "Aux" button on my TiVo remote control and operate changing channels etc with my Sky remote. (Found that TiVo took ages to tell sky to change channels if I used the TiVo button). Sadly, I cannot get the Harmony to operate the "Aux" button in such a way so that it the green light on the TiVo turns orange and I can change the channels fast through Sky. Can anybody help or point me in the right direction? I have even made a custom button on the Harmony to operate the "Aux" button but still does not work. Thanks anybody for putting me out of my misery.