Almost any effect can be used subliminally or to extremes. But tremolo is a little extra special when employed at its weirder limits. Unlike reverb or delay, for instance, which approximate phenomena heard in the natural world, tremolo from anything other than an amp or pedal tends to occur in the realm of altered states—suggesting the sexy, subterranean, and dreamy. Such moods can be conjured with any single tremolo. Put two together, though, and the simply sensual can be surreal. Modify this equation by mating two distinctly different tremolo types, and the possible sound pictures increase manifold.