These instructions should be used when using the US-122 with Mac OS 9.2.2 or lower. OMS is not used (or needed) in Mac OSX.

Cubasis, ProTools and several other
applications rely on OMS for MIDI
implementation. OMS (Open Music System)
is a standard for MIDI management
on the Macintosh. Since the US-122 can
send and receive MIDI, you will need to
install OMS in order to use the US-122.
The exception is Digital Performer,
which utilizes FreeMIDI. The drivers
support OMS and FreeMIDI independently.

To set up OMS to work with the
US-122:
1. First, run the OMS installer. If you
do not have the current version of
OMS, it may be freely downloaded
at opcode.com
2. Locate the US-122 Drivers folder,
which was placed on your desktop
when you ran the US-122 installer.
In this folder, locate the US-122 OMS driver.
Drag the US-122
OMS driver into the OMS folder
inside your System folder. Do not
drag this file into the Opcode
folder on your hard drive - it will
not work correctly.

3. Restart your computer. Then connect
the US-122 and start the OMS
Setup application (located in the
Opcode folder on your hard drive).

4. Select New Studio Setup from the
File menu. When prompted to
select a serial (modem or printer)
port, leave both selections
unchecked. Click Yes and continue.
OMS will assess all the MIDI ports
attached to your computer and
build OMS instruments for the
ones it recognizes.

5. When the setup is complete you
should see a list of all your connected MIDI ports. At the least you
should see two icons pertaining to
the US-122 specifically: the US-122
icon, and the US-122 MIDI port.

Once OMS setup is successfully completed,
you can proceed with setting up
the US-122 with your chosen application.
Please refer to the specific documentation
for your application for more
details.