Set up modulation routings
You can route modulation signals to almost anything in Serum. To do so, drag from a modulator’s routing handle (the three-quarter circle next to the modulator name) onto the parameter of your choice. To determine the strength (amount) of any routing, hold Alt while moving the destination parameter. You can immediately make a routing bipolar or unipolar by clicking the destination with Alt-Shift. You can also set up your routings in the Matrix tab, where you also get to choose a curve for the strength of lower to higher modulation amplitudes, and even modulate the source further.