All MIDI events are sent to a Virtual MIDI Output. This can be seen just as a real MIDI port but software only. A MIDI compliant application (like Logic Pro or Live) can receive the events from the virtual port named OSCulator Out.

This event converts an OSC message in the range of 0.0 to 1.0 to a MIDI Control Change in the range of 0 to 127. It will be sent on the specified MIDI Channel.

This event converts an OSC message in the range of 0.0 to 1.0 to a MIDI Control Change that only has the values 0 and 127.

In practice, this very useful event can be used for example to toggle an effect in a sequencer from a sudden acceleration of the Wiimote¹⁾. In can also be used to convert a OSC fader control to a MIDI toggle.

Like any event that is triggered, the threshold is set at 0.5, meaning that the toggle switches its position when the input value crosses 0.5.

If you want to route those messages to a “real” MIDI device, like a synthesizer, you will have to use a “patchbay” application which will take the events from OSCulator Out and send them to a MIDI port available on your MIDI interface.

There are several free programs that can do that for you:

• MIDI Patchbay written by Pete Yandell.
• MidiPipe written by Nico Wald.

Note to long time MIDI users: the the IAC driver is no longer the preferred way to send MIDI messages across applications. Virtual MIDI Ports, like the one OSCulator uses, are made for that and are much more efficient. If however, your target application needs a IAC based port, you can use the previously mentioned softwares to do the proper routing.

There is a very underestimated feature of Mac OS X which is the Networked MIDI driver. You can control it in the Audio MIDI Setup application.

Here is an example on how to configure the MIDI Network Driver in order to control many computers running Mac OS X and the Resolume Avenue VJ software.

• First, configure OSCulator so it controls one instance of Avenue with MIDI messages.
• On the master computer (running OSCulator), go in the Audio MIDI Setup application and click on the MIDI Devices tab.
• There is a Network interface, double click on it.
• Select Session 1, and click the Enabled checkbox.
• On the other computers, open Audio MIDI Setup as well, and enable Session 1, change “Who may connect to me” to Anyone.
• Back to the master computer, connect to each slave computer. This will add them to the list of participants.
• Last step in Audio MIDI Setup: In the Live Routings section (lower right), select OSCulator Out in the first drop down menu. This will send event coming from OSCulator Out to all the participants in the network.
• On each computer (master and slave), change Avenue settings and tell it to use the Network Session 1 virtual MIDI interface, instead the previously configured OSCulator Out.

Using a wireless WiFI network, the latency is about 3 ms, which is ten times less than a frame duration at 30fps, which makes is usable for live VJ performance.