Audio input functionality issues with iMac and XP

I am looking for any help that anyone can offer with an iMac line-in audio issue. I just purchased a new iMac 27 with the 3.6 processor (not quad core). The unit has an audio line-in input and a line out / headphone port. I am trying to use an XM PCR unit with the iMac but I am not having any luck. The XM PCR is a usb based XM radio unit that uses the usb port to control the unit. The unit also has a headphone jack size cable that carries the audio to the iMac.

I installed all of the OSX updates (snow leopard) and I installed all of the drivers for the XM PCR. The unit is working through the usb and the iMac controls the unit with no issues. I plugged the unit directly into a pair of speakers and verified that audio is being carried over the headphone cable properly.

When I plug the headphone cable into the line-in port on the iMac, the sound is not audible over the built in speakers or through the external speakers that are connected to the iMac. I was able to finally get the audio to carry over on the iMac with a program from Rogue Ameba called Linein. I am unable to hear the audio though if the Linein program is not running in the background. I checked all of the input / output settings on the iMac and adjusted the line-in levels and still no audio without the program.

Now, the main problem that I am having is using the line-in on the boot camp side. I installed XP on the boot camp side and I am unable to use the line-in input whatsoever (no sound) and I can not find a program similar to Linein. I then tried to install XP on a virtual machine with Parallels 5.0 and still unable to hear the audio over the line-in input.

I contacted Apple support and they told me that they do not support the boot camp side or the virtual machine side, so no luck there. I asked them about the OSX side of the machine and the fact that I need to run the Linein program and they politely told me that the Line-in input is not for that purpose. They could not tell me what the line-in port can be used with or how to fix the port. (I had the same results with trying to plug in an ipod with a headphone cable). The Apple support specialist told me to continue using the Linein program but could not provide any other support.

I contacted Parallels support and the only advice that I was provided was to reinstall Parallel tools. That did not work either.

If anyone can provide a solution for the XP (boot camp or virtual machine) side, I would really appreciate it. Additionally, if there is a workaround for the XP side, like the Linein program for Mac, I would really appreciate that too.

This is so frustrating after spending so much on a machine and Apple can not provide a solution. I have checked the web and the forums and have had yet to find any solution.

Thanks for any help.

 

Does any one know what sound card is being used in the new iMac's and an appropriate driver for windows XP?