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Message: <blockquote data-quote="FLY" data-source="post: 173531" data-attributes="member: 24631">you have to either connect the comcast cable directly to PC so that mp can change (tune the channels eliminating cable box). The downside of this method is you can get only first 99 analog channels.if you want media portab to control the cable box to change channel, you need an IR transmitter (most common is MCE USB IR tranciver). and use a mp plugin  like ir blaster or MCE replacement plugin which sends ir codes thru a tiny ir transmitter which you stick onto the cable box.I did this method before when I had comcast. it is about 90% accurate. Sometimes it doesn't change the channel exactly as you want and you end up with wrong recording.MCE replacement plugin has comcast box codes build in .</blockquote>