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I'm using the serial Igor IR reciever as well. What's funny about it is that if I use the remote control that I used to program the PAC with everything works smoothly when I hold down the volume up or down buttons. When I hold the same buttons down on the steering wheel the PAC either spits out the code too fast or too slow and causes a jerky response. So I usually have to tap the volume buttons which I don't like. Keep in mind I'm using the older PAC SWI-2. The newer SWI-X may not have this problem.
I've got plenty of CPU grunt so I don't think that's the issue, but I think I'm going to try the USB-UIRT and then use my one serial port for the XM radio controller cable.
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