The Modulation Matrix

For FM synthesis, pitched oscillators are used as both modulation sources and modulation destinations; this is possible for other modules as well, as it is with the LFOs that can modulate each other’s oscillator frequency. The modulation matrix is used to connect sources and destinations during the voice object’s update phase. The matrix must therefore know the locations of all of the source values as well as the locations of the destinations. Each SynthModule object includes two Modulators member objects: one for incoming modulation values and another for modulation outputs named modulationInput and modulationOutput. In the SynthLab ModMatrix object, any number of sources may modulate the same destination. The modulation matrix’s parameter object stores a set of modulation routings, and you may add, remove, or re-configure the routings at any time. The ModSource structure contains a single intensity parameter, while the ModDestination contains its own intensity variable plus the channel and hardwire-enable and intensity parameters.