Is there an alternative to the IR control cable. My box does not have a serial cable and i must use the control cable supplied by TIVO to communicate with the front of the cable box. The channel changing is terribly slow. It got better once i upgraded to 7.2 software. Is this something that is common to most TIVO to cable box channel changings? The box is a Dual DVR Motorola DCT 6412/2500 and has no serial ports, but does have an IR female plug in the back.