I used to have the Velo24x TDK drive, it had the worst DAE i have ever seen but i had no problem while burning audio. My first guess would be that you have used this drive to extract the audio files to mp3 or wav and then tried to burn them (which will definetely give you bad audio which wont be the result of burning but of ripping). So first suggestion: use another drive for ectracting the audio files.
If you havent used the TDK drive for extraction then it must be the media or the progiie you used for converting the wavs to mp3s and vice versa.
Memorex is said to be crappy media, and TDK can be crap also sometimes. If you are from Greece (as your username clearly indicates ) i suggest using either EMTEC or SKC clearly because this is what i used for audio when i had this particular drive (I know nothing about the quality of SKC as far as C1 C2 errors are concerned - in case Alex comes burging in )
Writing at lower speeds is said to give you better results, but i have seen no real justification for that up to now. I also burn audio at lower speeds, lathough i have never encountered problems burning at higher speeds, appart from those cases i used crappy media.
CCD is known for its cloning capabilities and not for audio - i have never used it for that. I suggest sticking to Nero or Feurio for burning audio.
Bottom line: use another drive for extraction, use EMTEC or SKC, burn at lower speeds and update Nero to its latest version, maybe that will solve the problem if it is based on the mp3 conversion to wav while using Nero or any other proggie.
See you around