
ROUTING MIDI TO REASON
41
Sending MIDI Data to
Reason
Setting up MIDI Inputs under Mac OS
Reason requires OMS to receive MIDI. How to install OMS is described in
the chapter “Installation”. OMS uses a concept of Devices, which basically
means an external MIDI keyboard or sound module etc.
➜ Each of Reasons’ seven MIDI inputs can receive data from one OMS
device.
Use OMS Setup to create the devices needed (for example one per in-
put).
➜ One OMS device can be used for several of Reason’s MIDI inputs.
However, note that this may lead to some confusion about what MIDI sig-
nals go where.
✪ We recommend that you use separate OMS Devices to each MIDI In-
put in Reason.
➜ If you have several MIDI programs running at the same time, they
can share MIDI ports between them. Again, this might lead to con-
fusing results and is probably best avoided.
! Please try make sure that MIDI data sent to Reason is sent to Rea-
son only, and not to any other application running at the same time.
Setting up MIDI Inputs under Windows
In the Preferences-MIDI dialog, each MIDI input pop-up will show all MIDI in-
put ports currently installed in your system.
Each of Reasons’ seven MIDI inputs can receive data from any port. It is pos-
sible to route several MIDI inputs so that they receive data from the same
physical MIDI In port, but you should generally avoid this as it can easily get
confusing.
➜ Reason only “grabs” the MIDI inputs you are actually using. MIDI in-
puts not selected in the Preferences – MIDI dialog are available to
other programs.
➜ Note that other MIDI programs may “grab” all MIDI ports in your
system when you launch them! If no MIDI inputs are available to
Reason on startup a warning alert will appear.
However, some of these programs allow you to disable the use of a par-
ticular MIDI input. If for example you have two MIDI interfaces, you may
be able to set things up so that one of them is used by Reason and the
other by the other application. Please consult the documentation for the
other application for details.
Sending MIDI Data from another Application
under MacOS
To send MIDI from another application installed on the same computer as
Reason, you need to have the OMS IAC (Inter Application Communication)
driver installed.
! Note that the IAC driver is not installed with the “Easy Install” op-
tion in the OMS installer. If you have installed OMS using this op-
tion, you need to perform a Custom install, where the IAC driver can
be selected (ticked) separately.
Installing more than one IAC Port
Once the IAC driver is installed, it is shown in your OMS Studio Setup dialog.
Up to four IAC ports can be defined.
1. Double click on the IAC Driver symbol.
2. Name as many ports as you require (up to four).
3. Close the dialog.
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