I have a Roland GR33 guitar synthetiser that I've trying to connect unsuccefully with a Yamaha QY100. As I've read the directions of both manuals I've done all correct. I don't know if I have to connect both MIDI cables, instead of just one (from GR33 "OUT" to QY100 "In". Does it work only in Record mode or also in Play mode? Can somebody with experience help me and explain me how to solve this little detail. I'll appreciate it.