The speed at which you burn will depend on the media / the cd drive and your computer. Its a good idea to run the tests like data transfer rate at least once to verify everything.
There could be several causes for distorted recordings.
- bad media.
- slow sample rate when recording an existing CD.
- issues during the burn like buffer underflow.
- damaged wave files
- a dirty laser lens.
when recording from an existing music CD,
WAV file: WAV is a file format in which Windows stores sounds as waveforms. Such files have the extension .wav. WAV files can be recorded at different rates. When WAV files are recorded at 44.1 kHz, 16-bits, and stereo, they are essentially identical to the music CDs that you buy.
use the disk at once option to elemenate the added 2 sec pause between tracks
experiment with known good wave files and do a couple burns of the same file at different speeds. my CD burner does a 32X write but i typically use a 12X write speed.