All the pre-defined classes of OMChroma have a mono output. The user classes (the classes made by the users) should naturally have multichannel output according with the used Csound's opcodes: "outs" for stereo output, "outq" for quadraphonic output and so on; but there is another more elegant way to manage the audio outputs : the OMPrisma Library. The OMPrisma Library allows a very sophisticated control on the sound disposition and we deal with some basic examples.
You must have installed on your computer the OMPrisma Library