Share MIDI information over a network in Audio MIDI Setup on Mac
Use the MIDI network driver to send and receive MIDI information between computers over a network.
For example, if you have a music studio with several computers connected to MIDI interfaces, keyboards and synthesisers, you can use the MIDI network driver to route the data from those devices to and from your computers over an Ethernet network. Without the driver, you would need to purchase MIDI interfaces for your devices and connect the devices with cables. With the MIDI network driver, you can have a central computer act as the master, sending and receiving MIDI data over the network to other computers and their connected MIDI devices.
To set up MIDI networking on your Mac, you first create a session, which identifies your Mac as a central location for MIDI streaming over the network. When setting up a session on your Mac, you specify the computer port that the network information uses, a session name and your computer’s name, which is seen by other computers on the network. You can also set up specific routings of MIDI devices. For example, you might specify that a MIDI keyboard connected to another computer route its MIDI data to a synthesiser connected to your computer.
In the Audio MIDI Set-up app
on your Mac, choose Window > Show MIDI Studio.In the MIDI Studio window, click the Configure Network Driver button
in the toolbar.On the left side of the MIDI Network Set-up window, click the Add button
below My Sessions to create a new session.To rename the session, click the name, then enter a new name.
On the right side of the window, below Session, specify the network computer port and a Bonjour name (or network name) for your Mac.
On the left side of the window, below My Sessions, select the session’s tick box to enable it and publish it on the network.
On the left side of the window, below Directory, click the Add button
and add the name, host and port of any remote computer (not on your local network) that you want to participate in the session, then click OK.Repeat for each remote computer that you want to participate in the session.
At the bottom of the left side of the window, click the “Who may connect to me” pop-up menu to specify which computers can connect to this session.
To start a session, click Connect.
Computers actively participating in the session appear in the Participants list.
To set up live routings, click the “Live routings” pop-up menus, then choose the devices you want to share MIDI information with.
To remove a session or directory you added, select it, then click the Remove button 
.