Kurzweil MP15 User Manual page 28

In order to participate in a multiple sound module chain, your piano must either be
used (1) as the controller or (2) be the last module in the MIDI chain. This is because
MP15 does not include a Thru MIDI port, this simply means that your piano must be
at the start or at the end of the MIDI chain.
Using your piano as controller, connect the MIDI Out port to the MIDI In port of the
first module, and then connect that module's MIDI Thru port to the input of the next
module, and so on, until the last module is connected. The MIDI chain should end in
the MIDI In port of the last module.
KURZWEIL MP15
8
2 8
MIDI