Siren includes an output voice that generates the CNMAT OpenSoundControl (http://www.cnmat.berkeley.edu/OpenSoundControl) protocol, which is sent out over UDP network packets. We generally use SuperCollider of CSL to create OSC sound synthesis servers, and then control them with messages sent out form Siren. For simple debugging, Chandrasekhar Ramakrishnan wrote Occam (http://www.mat.ucsb.edu/~c.ramakr/illposed/occam.html) a stand-alone OSC-to-MIDI convertor for Mac OS X.

The built-in examples demonstrate using OSC with the Occam convertor, to test OSC output using a MIDI synthesizer.

   [OSCVoice midiScaleExample]