Yamaha DTXpress/DTXplorer/DTXtreme

Hello, 
I just bought my first electronic set--the DTXpress III. I am very 
happy and excited about this purchase. However, I am running into a 
couple of difficulties, for which any help would be appreciated.
Problem 1:
these songs do not produce any sound, though the song light is 
blinking as if with the click: shamanx, stepoff, thwak!, ganoosh. 
photon plays but only a noise every 2 and 1/2 beats.
Problem 2: I am trying to record a song in the open song position 
(97), but I cannot get it to play back. when i hit play the song 
light blinks again as if with the click, but there is no sound.
I am new to this and may be doing something wrong. Please advise me 
on what to do to solve the problem. Thanks in advance