If it's just a cable box, then it probably does not have A/V outputs -- just the RF cable input and output. That can not be connected to the 1050. What you could do is either pass the cable signal through your VCR (which you may be doing already) and then hook the VCR's left/right audio and composite video outputs to the 1050, or see if your TV has left/right audio outputs and connect those to an input on the 1050.

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