JLCooper MCS3 SP USB for OSX - Manual (Page 21)

To access the MCS3ʼs MIDI messages in your MIDI application, connect your
applicationʼs MIDI input and output ports to the ports labeled “MCS3”. Depending on the
application, the ports may be labeled “MCS3 SP USB”. The exact method for
connecting to MIDI ports varies from application to application. Consult the manuals of
the MIDI applications you are using to learn how to do this.
MCS3 SP USB Software
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