MP3 and AAC files mixed in burned Audio CD???

Here is the story. I am new to iTunes and I have a 400Mhz G4 AGP Machine running OS 10.2.8 and have Quicktime 6.5.3 installed. I also have a 93 Gig HD and 512 megs of RAM and a Sony CRX160E iLink CD burner. I was running iTunes 3.0.1 for a little bit and just upgraded to 4.7.1 about a week or 2 ago. Can I mix "MP3" encoded tracks with "AAC" tracks. I think that I read in the help menu that I had to use the "Data CD" option instead of the Music CD option. But, if this is so, can I still play this CD in a regular CD player? since was encoded with MP3 and AAC and it is formated as a Data CD??? The reason I am asking is because I encoded a bunch of songs as MP3s in 3.0.1 as default and I understand that AAC files are of slightly better quality so, I wonder if it would be worth it for me to re-import my songs in "AAC" for consistency. Consistency is my main concern. I want to be able to burn CDs with little problems (although I have some issues but, that is a different story) and mix formats if I can.
Thanks,
Larry

Thanks for your help! I just burnt a CD with mixed formats and it played fine in a "newer" CD player. My home CD player is older (Circa 80s or 90s?) and I have been told that the older CD players either can't or, don't like CDRs. So, it played fine in my son's newer CD player but, not in my "older" player. I am not too sure about the difference in sound quality yet. I'll have to do some more testing. The MP3 files and AAC files both sounded well when played. One annoying thing, though is the volume issue. Most of the songs played at a similar volume but, one played quite softly. An annoying thing but, I understand that even if you use the "Sound check" option, the sound can vary due to the fact that iTunes has a "fast" way of reading the sound levels and could be inefficient. I will try "iVolume" to see if that helps. It is supposed to be pretty good for iTunes except for the version 7 that just came out.
Thanks again,
Larry

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