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Step one: pick a layer with a different job
Start with a preset you like but find slightly flat. Say it is a bright saw lead that sounds sharp but lacks weight. Instead of duplicating it, choose a second sound that fills a missing area: a softer square patch for body, or a pad-like tone for sustain. Load it on a separate track, copy the same MIDI notes and lower its level until it supports rather than competes. Two sounds with similar tone just stack up and sound louder, while two complementary sounds start to sound fuller.
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Step two: separate the layers by range and space
Next, give each layer its own space so they do not fight. On the original saw lead, trim some low frequencies with a gentle high-pass filter. On the body layer, roll off the harshest highs so it sits underneath. Then widen carefully: keep the main lead near the center and nudge the second layer slightly with stereo spread or a small octave shift down. In the example, the saw stays focused and the square lives beneath it, adding warmth. If the combined sound feels cloudy, reduce the lower layer before adding any extra effects.
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Step three: glue the layers and check in the mix
Finally, route both layers to one group channel so they behave as a single instrument. Add light saturation or a soft compressor to blend them, then adjust a short reverb to give them a shared environment. Solo the lead once, then play it with drums and bass, because a layered sound that seems huge alone can disappear in context. Mute the second layer and bring it back to confirm it still adds something. If you cannot hear a clear improvement, change the layer's tone or level, then save the combined chain as your own preset.