I am unable to play the synthesiser in my D-Coder using Logic / DP on Mac OS X - what is going on?
D-Coder is a kind of "special" plugin as it is both an audio effect and a synthesizer in one. In the current Audio Units specification, there is no defined way of handling this kind of plugin. An Audio Units plugin is either defined as a music device (instrument) or an audio effect. The D-Coder is both.