yFromSignals</code> allows to create the factory from a list of outputs signals built with the <a href="https://github.com/grame-cncm/faust/blob/master-dev/architecture/faust/dsp/libfaust-signal.h">signal API</a></li>
<li>the library keeps an internal cache of all allocated <em>factories</em> so that the compilation of the same DSP code -- that is the same source code and the same set of <em>normalized</em> (sorted in a canonical order) compilation options -- will return the same (reference counted) factory