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you can do everything the pcr does through the headunit port.... besides any modifications to the xmDirect itself would put you in a legallity issue with xm....remember the reason that they discontinued the pcr is because they want to stop the mp3 recording with time trax...if you are modifiying there product you are allowing this to happen again and could put an individual at risk.....just a word of advice.....we have been working on this and I can assure you that the two devices are quite diff in protocol the main problem we have been having is getting it to sync up before the computer takes full control....and what i mean is when the unit has power applied to it (12v) the first time the headunit makes a communication with the tuner...there is some sort of syncing going on.....once this has happend we can remove the controller and operate solely on the cpu ie....power on/off channel ....ect....
While an internal modification of the type I propose (should it even work) will void the warranty, it will most certainly not bring legal action from XM. It is in no way worse than the digital audio modifications available nor the serial control modification for the SkyFi. I have two XMPCR units with voided warranties and "illegal" TOSLINK modifications that I'm sure nobody would have any problem with me selling for $500 on ebay. Do you intend to publish the XM Direct protocol when you figure it out? If I am able to find a solution that will result in wider compatiblity and lower cost, it's going to be published publiclly. I very seriously doubt that people will have trouble with voiding the warranties on a $40 device -- the mp3car community doesn't seem to have a problem voiding it on $350 LCD monitors!