EXP Computer CD Traveler Plus - Manual (Page 27)

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If your computer is equipped with a sound card, you can also connect the
LINE-OUT jack of your CD-ROM to the LINE-IN jack of the sound card with a
3.5 mm audio cable. This will result in a better audio output from the
speakers of the sound card.
The CD-Audio sound will come out through the Line-Out or Headphone
jack ONLY.
The PLAY/PAUSE, NEXT/PREVIOUS buttons will still work in CD-ROM
mode. However, these buttons should be used in audio CDs playing mode
ONLY. Using these buttons other than playing audio CDs will cause an error.
Also, do use these buttons along with a CD audio software utility. Otherwise,
incorrect information may be reported by the CD audio software.