very interesting topic, thanks to the OP for pointing this out.

personally, i use Feurio for all of my audio CD burning needs. it will not let you burn audio faster than 24x as i recall - or there's at least some message stating that potential problems occur if you burn faster than 24x for audio CDs. as has been implied above, it may not be that the WAV data written to the CDR is faulty, but that a normal CD player (i.e. not CD/DVDROM drive) may have problems playing back the burned disc. very interesting stuff, indeed.