Emu XL-7 & MP-7 User's Group

I wanted to know how to make a song.  I have my song broken into 
different patterns.  Such as a patteren for the chorus and another 
pattern for the verse.... etc.....

how do I get the XL-7 to string them up?  

All I have been doing is changing the patterns while its plays 
another pattern and pressing "home".  Then it palys into that pattern 
when the previous pattern is done.

tcdave