1. changed  jsaBufferNoiseNode to return a node factory rather than to be a node factory so that data could be encapsulated privately and not shared between models that use the node. 2. Fixed the convolve opcode so that convolvers are not shared between models that use the unit. 3. Added a baseModel.detroy funciton that can be used to disconnect nodes when a sliderbox window closes so that they don't continue to suck resources.