Yamaha DTXpress/DTXplorer/DTXtreme

1. Is there any way to change the tempo of the drum looops.  I'd 
like to incorporate some of the loops with some live band music.  
But I'd like to be able to speed up or slow down the loop.  If this 
is possible, please let me know.

2. Is there anyway to set the metronome click to come out of the 
headphone only.  I would like to do this so I could... let's say... 
overlay a song i had made over some live music, and not have the 
metronome heard by all. Just by me.

Any help would be greatly appreciated.  Thanks much!