Yamaha DTXpress/DTXplorer/DTXtreme

i am new to the dtxpress and have a few basic problems.

main volume:  the main volume seems very low.  the aux volume and the 
volume of the songs and pre-programmed drums can be cranked up nice and 
loud.  but i have the main volume turned all the way up and the drums are 
so low ...even when i turn the other volumes down.  i even went in to some 
of the drums and cranked their volume to 127...still very low. any ideas?

song looping:  there's this great latin number programmed (i think it's 
#32) in the module but it only plays for about 2 minutes.  i thought the 
songs play continuously.  is there a way to keep the song going so i don't 
have to stop playing along and restart the song?

thanks for any help.  this group is great.