It all adds up
As well as their bona fide analogue waveforms, Trueno’s oscillators can also each be set individually to Digital mode, turning them into additive generators drawing on up to 64 sine wave partials. Not only that, but these partials are fully user editable, making it possible to design your own raw tones from the ground up, for discrete usage and bolstering of the analogue waves, not to mention as modulation source signals in VCO 3.
To access Digital mode, just step the waveforms past the three analogue forms, or click the D button. Clicking the S button that appears in Digital mode changes the waveform view to the Spectral Editor, where dragging upwards in the graph display increases the amplitude of the partial under the mouse pointer, and dragging left and right sets multiple partials together, in standard additive synthesis style. Being absolutely tiny, as it is, the Spectral Editor is extremely fiddly to work with in its default state, but the zoom in/out buttons alleviate this somewhat, as you’d hope.
Having said that, with 256 preset waveforms onboard, including resampled basses, bells, guitars, keyboards of various kinds, flutes and more, you may never need to get your hands dirty with it anyway.