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 synthesizers, you can use the MIDI network driver to route the data from those devices to and from your computers over a 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 primary device for other computers and their connected MIDI devices. The central computer sends and receives MIDI data over the network.
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 network name, which is seen by other computers on the network. You can create different types of sessions, including Network MIDI 2.0 sessions and RTP sessions.
In the Audio MIDI Setup 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 Setup window, click the Add button
below My Sessions to create a new session. Select the type of session you want to create (Network MIDI 2.0 or RTP).
To rename the session, below Session Details on the right, edit the Local Name field.
Below Session Details, specify the network computer Port and a Network Name for your Mac.
If a warning icon appears next to the Network Name, check your network configuration for a duplicate name.
Turn Enabled on at the top of the Configuration section to enable the session and publish it on the network. Or select the session name under My Sessions.
On the left side of the window, below Sessions and Directories, 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.
In the “Who may connect to me” section, click the Connection policy pop-up menu to choose which computers can connect to this session. Options include “No one” (with a lock icon) and other permission levels.
To start a session, click Connect.
Computers actively participating in the session appear in the Connected Peers section.
To set up live routings, click “Live routings” under Session Details, then choose the devices you want to share MIDI information with.
To remove a session or directory you added, hover over it, then click the Closing menu button 
.