Morphing between two parameter sets gives additive synthesis a single performable control dimension

Morphing solves the expressiveness problem in additive synthesis by collapsing the high-dimensional parameter space to a single control: a smooth transition between two complete sets of additive parameters (Sound A and Sound B). As the morph control moves, all partial amplitudes and frequencies interpolate simultaneously, yielding a smooth, controllable timbral transition. The Nord Modular implements this via Morph Controller Groups (up to 25 parameters per group), preferred over waveform cross-fading because cross-fading requires duplicating most of the patch. An alternative is wave-terrain synthesis, where the performer specifies a trajectory through the parameter space.

Examples

Nord Modular patch: Morph Group assigned to knob 1 interpolates between a resynthesised piano sound and a clangorous inharmonic sound. Oscillator sync (knob 2) controls whether partials lock phase in the inharmonic state.

Assessment

Explain the difference between cross-fading two waveforms and using a Morph Controller Group in additive synthesis. Why does the textbook prefer Morph Controller Groups for the Nord Modular?