This paper gives an overview of one of the most important features in our synthesis language called PWGLSynth. We will concentrate on how to represent visually multichannel signals in a synthesis patch. PWGLSynth synthesis boxes support vectored inputs and outputs. This scheme is useful as it allows to construct compound entities which are used often in sound synthesis such as banks, parallel structures, serial structures, etc. PWGLSynth provides a rich set of tools that allow to manipulate vectors. For instance vectors can mixed, modulated, merged, or split into sub-vectors.