Yamaha MU128 Owner's Manual page 165

Dump Out Functions (DUMPOUT)
To reload the data from the data recorder back to the MU128:
Make sure that the devices are properly connected (see the illustra-
tions on page 162), and execute the appropriate data transfer operation
from the data recorder. (Refer to the owner's manual of that device for
instructions.) The MU128 automatically receives incoming bulk data.
165
MU128 Utility Mode