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

Hello all!,
First posting here.... Perhaps Im daft, but im havin the darndest 
prob tryin to sequence chase my sp808ex to my MP7. Since my 808 
doesnt have a deadicated thru, I must switch the out over(to thru) 
internally. When I do this the MP7 lox up and produces the most 
anoying sound you ever heard when a pad is hit. I had the same 
occurance happen when I had a MC307(before sent to eBay heaven LOL) 
its midi channels started at 17(?!), but it had a omni setting(<old 
tech aint it?) so it was cool to run with the likes of Sonar. No such 
animal with the 808ex and have tried different channel combos and 
sysex numbers. Any suggestions, or am I just over looking the obvious 
through a cloud ov BudLight?