How come the track I just recorded on the CD-R drive doesnt playback through the headphones or internal speaker?
The Phone Selector is incorrectly set. Switch to the LINE OUT setting to monitor playback from either drive. If the Phone Selector is on CD, you will only be able to hear playback from the CD playback drive. If the Phone Selector is on the MIC/LINE and AUX settings, only those signal paths will be audible. Also, be sure the internal speaker is switched on.