Thanks a lot, Pianobench. it is greatly appreciated your help.
the manual is useful and i believe the MX100B is the same as MX101R in japan. it is good that you have directed me to this manual and now i can have a copy to understand how the midi part work.
btw, can you explain to me what is the different in between MX100A and MX100B please? looks to me they are the same as they are sharing the same manual.
thanks
Ray